Why Y Chromosomes Might Disappear

Is it possible that Y Chromosomes might actually disappear from genetic code? What would happen to species as we know them? We're generally taught that chromosomes determine an animal's sex, but turns out, it is way more nuanced than that. Learn what's going on in this new episode of SciShow, hosted by Rose Bear Don't Walk!
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Support SciShow by becoming a patron on Patreon: / scishow
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Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:
Chris Peters, Matt Curls, Kevin Bealer, Jeffrey Mckishen, Jacob, Christopher R Boucher, Nazara, charles george, Christoph Schwanke, Ash, Silas Emrys, Eric Jensen, Adam, Brainard, Piya Shedden, Alex Hackman, James Knight, GrowingViolet, Sam Lutfi, Alisa Sherbow, Jason A Saslow, Dr. Melvin Sanicas, Melida Williams
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Sources:
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[@Viewer2812]

"Sex that develops based on temperature" This gives a whole new meaning to "You're hot" and "We're cool"

[@danielvicentecarvalho3687]

And extinction by global warming.

[@beanietasticday]

Lmao

[@jordanmacleod3688]

That’s how turtles 🐢 sex is determined

[@elultimo102]

@@jordanmacleod3688 A naturalist: "Cool Dudes" and "Hot Chicks."---good way to remember. I think crocodilians are the opposite.

[@spfein]

@@elultimo102 I thi k they're the same from what I remember cooler makes females

[@uplink-on-yt]

My Y chromosome isn't small. It was just cold, that's all.

[@icarusunited]

Nah it was dry didn't you read aristotle

[@ChrispyNut]

LOL. How rude! :-)

[@fannyalbi9040]

u mean u r a reptile?

[@dwaynowilli6822]

Wow... ^^ don't think they got the joke...

[@KEVMAN7987]

It was in the pool?

[@danielmetcalf]

"On top of being semi-aquatic, egg-laying mammals of action..." is a nice little Perry the Platypus easter egg you laid there ❤️

[@tingobingo1401]

The video mentioned in the title starts from 8:00 Thank you very much ❤️

[@jesuslikedpie]

Is that how long it took for her to her to explain how she was using male and female to avoid hurting feelings?

[@tingobingo1401]

@@jesuslikedpie till 8 minutes she was explaining how is sex determined in humans and animals.

[@gargigaikwad6239]

Underrated comment

[@Novastrous]

Thank you kind human ☺️

[@shooooooooopi]

@@EvanFerrao I’m part of the lgbt community. Why should this offend me/us, exactly? Also find a new joke

[@xeros4000]

i swear, platypus was just a beta test enviroment for random traits, that somehow made it to live build by mistake.

[@iciajay6891]

Nature is fond of good enough not survival of the fittest. Its more survival of good enough to make it to reproducing. And all the wacky stuff that can happen def help there chance. You can rn have human s that are XY, XX, X, XYY... we already got weird in humans.

[@Dreagostini]

@@iciajay6891 Yeah.. being able to reproduce in high enough numbers means this version of the animal is the version that fits the best into it's niche. Which survival of the fittest means.

[@BLOODKINGbro]

@@iciajay6891 Nah nature typically takes the easiest route of whatever just works. Futanari on the raise!

[@bcubed72]

@@iciajay6891 Yes. Darwin is a tough teach, but most of his tests are "pass/fail."

[@SquintyGears]

@@iciajay6891 yes and this doesn't account for those who have XY but with a random or rare mutation. Even XY "egg producers"

[@arcaneusumbra1539]

Bold of everyone to assume we'll still be human as we know it by that time

[@charlesballiet7074]

im pretty shure removing that last chromosome leads to downs syndrome

[@squeezlebub3593]

@@charlesballiet7074 Down Syndrome comes from a having an extra copy of the chromosome 21. You’re right that it’s a chromosomal abnormality that causes it though.

[@TehMorbidAtheist]

Why wouldn't we be humans? Condoms stopped evolution.

[@Drexistential]

@@TehMorbidAtheist Nothing stops natural selection...

[@OakenTome]

@@Drexistential Modern medicine does, to an extent. People that would’ve died before they had the chance to have children and were saved by technology.

[@Planet-of-the-Gibbons]

Thanks. I had heard about this Y Chromosome disappearing thing, and like many people with low knowledge on biology, I thought it meant the extinction of human males in the far future! Misconceptions need good explanations like this to go away.

[@TheCc064]

We can hope lol

[@Planet-of-the-Gibbons]

@@TheCc064 Hope for humanity not to go extinct in this century. wars, microbes, asteroids, etc lol

[@sweetpotato3910]

ohh no better I changed my sex orientation from now on to become a lesbian

[@Planet-of-the-Gibbons]

@@sweetpotato3910 But still, it doesn't change your biology. We're talking about biological evolution here not psychology.

[@apokailyptic2899]

The majority of human males should go extinct though. Only the top 10% of alphas should be allowed to stay and breed. Better for our species in the long run.

[@TheKasimkage]

There are also cases where XX humans develop male phenotypes and XY humans develop female phenotypes. I think because it doesn’t really show any negative affect, there’s no real need to test for it so nobody knows how common it is, just that it is a possibility.

[@TheKasimkage]

@@tinyrockyplanet8953 Some people think that just because you have the chromosomes of one sex means that you will 100% develop all of those characteristics and be 100% that sex. I just used phenotypes to mean the expressed characteristics that can be observed. If it had another meaning, I didn’t mean it that way (and I doubt that’s how it was meant when I learnt about it in college). What I’m basically trying to say is that there have been cases where people have XX and develop male physical characteristics indistinguishable from XY males and vice versa. But since it seems to have no impact on development, nobody really tests for it so we don’t know how prevalent have genes of the opposite sex is.

[@codyhecht8634]

Why are you spreading misinformation? The scenarios you are describing are called srY detachment and/or deletion, and it can absolutely have ramifications.

[@TheKasimkage]

@@codyhecht8634 The last time I heard about it was on a science related channel, where they said what I said. The only times I’ve heard anything about it being false have been when it comes to anti-LGBTQ people, so naturally I dismissed them, assuming that they were just looking for another avenue to be hateful. I’ll look into it more before saying it again.

[@wolnagalicja350]

​@@TheKasimkageThats very true what you are saying but some moronic DNA testing companies dont understand that and refuse performing genetic tests-their statement"Women dont have Y chromosome". Also Pulaski turned out to be genetic woman.

[@wolnagalicja350]

​@@vyor8837infertility yes and disphoria yes

[@kurczaczak]

Traveling ten thousand years in the future would be fascinating. Traveling ten million years in the future would be terrifying

[@danielharvison7510]

Right now, I think about 100 years would be more than I could stomach!

[@SeanKula]

@@danielharvison7510 yep. With political correctness and so on.

[@danielharvison7510]

@@SeanKula Certainly not. It's the resurgence of the drums of war, hate and intolerance that alarms me. More division, more hostility, more people in need. Disaster that can only be averted by united action, and that's not something that we humans do well. That's what concerns me. There's far more to fear than being told to "mind your manners" online. Back in the day, you didn't have to be told to show basic courtesy to people you've never met. The advent of online anonymity seems to have destroyed that.

[@windumaster14]

@@danielharvison7510 yeah i wonder who's driving the division, certainly not the people whose modus operandi is to browbeat others into submission for being to the right of stalin

[@danielharvison7510]

@@windumaster14 Yeah, look, if you're only looking at these events through a political prism and by taking sides in pointless, partisan conflict, you're making it worse. Burying the hatchet is an essential part of making peace. Can't do it without it.

[@n00bt00btv]

The issue with the fragile Y hypothesis is that it assumes that there haven't been emergent factors that have given Y chromosomes stability. The Y chromosome degrades over generations, not over time, and so the presence of the Y chromosome in so many animals who should have run into the same issue by this point tells us that the fragile Y hypothesis is a question looking for an answer.

[@6Sparx9]

ya hear that lads? we're saved!

[@HishighnessMrL]

@@6Sparx9 She explained that if the y chromozone no longer existed there would be another sex determiner, so we lads were never going anywhere anyway 👍

[@johnapples2018]

Are you saying you don’t trust science!? REEEEEE!!!!

[@charlesco7413]

@@HishighnessMrL Yes but would a male have the same traits as they do now? Men have a higher muscle density, larger brain volume, ect...

[@HishighnessMrL]

That's the sort of question that would take years of research to find the answer to heck some unknown lab is probably doing research into the subject as we speak. So of course this random guy on the internet could definitely not give you a reliable answer but hey males would still exist yey 🙂

[@Gaston-Melchiori]

I love that you put the sources in the description. Very few people do.

[@PJoriginal]

I'm surprised they didn't talk about animals like clownfish who can change sex on the fly. IIRC If the female dies, the male changes into a female

[@rickseiden1]

Nemo's Dad would have been Nemo's (new) Mom!

[@ChrispyNut]

I thought they'd go there too, but ... do we know how they do it? Without that, not sure it belongs here (though something's niggling in my brain that they mentioned a species without an explanation for how :-\)

[@ChrispyNut]

@@RNCHFND Depends where you apply the lipstick to pucker up. ;-) Probably need some additional, uh, jewellery shall we call it?!?!

[@iciajay6891]

We do have humans that are XYY and X rn and ppl wrist 2 types of DNA ( chimerias) over 30 ( so far) types of intersex. I guess this is just the extention of the possibilities. We already get more them 50% DNA from our mother's. So the female body does not reject the fetus if it changes to male ( all fetuses are tech female, the male will change if the sperm carried the info to be male). Anyway, it is already skews to the female side.

[@rac2300]

@@rickseiden1 more like nemo's new wife....if we're being real...

[@ptrkmr]

He’s a semiaquatic egg laying mammal of action He's a furry little flatfoot Who never flinched From a fra-ee-ay-ee-ay He's got more than just mad skill He's got a beaver tail and bill And the women swoon Whenever they hear him say ADRDRDRDRDRRD He's Perry, Perry the platypus

[@SpringStarFangirl]

PERRY, PERRY THE PLATYPUS

[@solar0wind]

TALKING 'BOUT PERRY Aaagent P....

[@Segen_Bell]

CALL HIM AGENT P!

[@NayrAnur]

Doo be doo be doo ba, doo be doo be doo...

[@candycemonroe7345]

The show got the color platypus appear under a uv light correct too!

[@kcoovi]

Imagine being the last guy with an XY chromosome meanwhile, everyone else around you moved to a new sex-determination system

[@haruhisuzumiya6650]

We already do

[@noorlita]

​@@haruhisuzumiya6650lol no

[@sceplecture2382]

@@haruhisuzumiya6650 No...

[@kaloveveskitchen7992]

You did a great job explaining. Any person on the street would understand. Your amazing

[@LimeyLassen]

That "which testicle it came from idea" is actually really clever, I kinda wish they were right about it, it would make science funnier

[@teemusid]

Like a faucet with separate hot and cold water taps.

[@TakaComics]

It would make gender-reveal party fireworks much worse though.

[@soliel5680]

Ancient scientists would put a group of males with both testis in 1 group as a control and have 2 other groups. One that was castrated on left and one on right to find out.

[@frutrace]

@@yoface938 That was my first thought. Henry VIII would've had 1 fewer ball and 5 fewer wives.

[@RedChaos1208]

@@TakaComics congratulations!!! It’s a left nut

[@zenmart]

I remember hearing once that “if there is one thing the history of evolution has taught us it's that life will not be contained. Life breaks free, it expands to new territories and crashes through barriers, painfully, maybe even dangerously, but, well, there it is.”

[@razorsharp1371]

knew it was jurassic park

[@doubletrouble2022]

I love Jeff Goldblum lol

[@bruceallen6492]

LOL

[@ashleycantrell9844]

"Life uh, uh, uh, finds a **way**"

[@igkslife]

Yes, but evolution is a predictable random process. If it's useless? Lose it. If it serves a function like mating purposes, and/or survival purposes. Then expand upon it. Evolution of gender was based on survival, and use mainly. Survival of the species more than anything. How the gender acts, and looks is based on mating preferences. With those evolution of how a gender looks, and behaves is also done by evolution. This can be apply to humans as well.

[@thelitterateman]

Pseudo-feminists gonna quote this so so much!

[@saintzayan8205]

The Y chromosome had been in effect for many millenniums. I don't think it's going away, not by a long shot.

[@thegoldensuperior1863]

Indeed, self recombination

[@ZeusTheIrritable]

Are we certain that the platypus wasn't dropped here by some alien civilization just to troll us?

[@jang3412]

Interesting - I always thought it was the Octopus was the alien pet left behind!

[@alexradke7597]

Nah, alien prank was actually how the Cambrian explosion happened, true fact

[@danielharvison7510]

That, and other weird critters would actually make some kind of sense. I blame Javik from Mass Effect 3, also for other weird animals like...those things...and those other things. Alright, Platypi are really quite weird. But we've also got Wombats and Koalas, right? And Kangaroos!

[@billjamal4764]

Are we certain all life wasnt?

[@PanduhDan]

Best comment of the week for me lol it’s thee weirdest mammal that lays eggs and carry’s venom as well as many other traits that most mammals don’t have . They actually have the same hunting senses as a shark !!

[@imsquiddly6836]

I had a female “friend” in high school who would always bring up how the Y chromosome is disappearing and soon all men would be gone. And yes, she was the kind of girl who constantly complained about how single she was.

[@DagazsYT]

She seems cool

[@imsquiddly6836]

@@DagazsYT I certainly thought so at the time

[@i10i60]

So an incel?

[@kdjoshi726]

Lmao

[@kdjoshi726]

@والد الهندوس That was the joke

[@firstlast-zw7uo]

This feels toxic because of the person explaining it doesn't have a y chromosomes

[@sombrahypuu5033]

So essentially it doesn't change that sex and procreation works the same only how its labeled or produced, essentially keeping labels of orientation exactly the same, gender identity does not remove scientific associations of sex in the hueman genome.

[@sombrahypuu5033]

Almost nothing changed its like having the same exact clothes but putting it in a different dresser.

[@sheila3348]

Genome: let’s get rid of this chromosome Me: Y? Thank you, I’ll see myself out.

[@chrisortiz2640]

I love this comment so much.

[@proculusjulius7035]

LMAO

[@alpha-xg4iz]

nono, don't. good joke.

[@ussarng4649]

I laughed .. really I did.

[@atticusrumi]

👏

[@jacobshore5115]

So, maybe Aristotle wasn’t entirely wrong, he just had the wrong species…

[@davidbass6780]

Or humans used to be sex determined by wetness and temp? And that things just changed. New DNA from a virus infection and that DNA stuck around, so our current y chromosome is from virus reproduction DNA?

[@ssgoko88]

@@davidbass6780 lol sure all that happened in a few thousand years

[@lyndsaybrown8471]

Or, maybe, he was a turtle

[@davidbass6780]

@@ssgoko88 why can't it? Only takes one mutation, then for the numbers of said people with mutation to grow. Then all you need is for the change to just stick around. And with the many world wars and general killing of humans that settled on islands and other places to add to the ownership of another country. It's plausible that ability to determine sex based on wetness and temp is just simply dormant now? Especially since another species does currently have what seems to be a missing sex chromosome. So temp and wetness could be a backup in most species?

[@refkiriswansyah2830]

@@davidbass6780 the problem with it mate...for that thing random mutation to happen and affect us as a whole species, it need to happen simultaniously with the same pattern & route, so its not random anymore right? Why? Because even in 4000 years ago, human population already spread all around the world. So a single random change to someone in one part of the world wont change much and can easily get 'normalized' again by reproducing with most normal individual which for sure has more amount and more chance to spread their 'normal' unmutated gene, hence get rid of the said random mutation. For your scenario to happen, it need to be happen way earlier, where a whole human soecies is only newly emerge hence only has 1 variation and small amount of population, or the said mutation happen all at once, in every corner of the world, and happen to most population. Which is by definition is not so random anymore.

[@georgepappas45]

imagine hating men so much you hate Y chromosomes

[@thegoldensuperior1863]

ROASTED!

[@MrCadet08]

"Y chromosome dying out......women most impacted and oppressed"

[@rodbenson219]

The idea that a species can switch from w to y or vice versa seems a little mysterious to me. For that to happen it would mean that near the changeover point there would be males in the species that have two sly genes on different chromosomes. Yet that system would lead to a sex ratio of three males to one female by binomial distribution. Therefore I can see how quite quickly the w,y phenotype would quickly replace the former single y (y,0) or w (w,0) phenotype. Yet once that breeding population is established, how does it ever get back to a single male sex chromosome through natural selection given the competitive advantage in males of y,w over y,0 or w,0? If the answer is in total sex chromosome degradation, through failure of recombination, then this suggests that the presence of sly on a chromosome must also block recombination. That is something that could easily be tested experimentally with modern molecular biology. I guess other possible explanations are the w,y phenotypes are less fit than their w,0 or y,0 counterparts so this dominates the 3 to 1 ratio ensuring that with time the population settles back to w,0 or y,0 or finally one of the sly genes on the other chrmosome is silenced by epigenetic control?

[@JC-ji1hp]

My thoughts exactly

[@vegatwice4342]

Humanity has a knack for predicting wrong things with too much confidence

[@churchofclaus]

But muh science

[@komurluekmek]

@@churchofclaus this isn’t even backed with science

[@lasercat538]

@@komurluekmek that's the thing about "muh science", it doesn't always have to be backed by science

[@killermakd2015]

the fact that you know its right or wrong is coz of humanity lmao. ironic aint it.

[@lasercat538]

@@killermakd2015 The point he was making was how much people spouted this theory with so much confidence

[@bon7029]

Imagine if human sex was determined by temperature. Doctor: Would you like a male or female child? Mother: Male, please. Doctor: Sure thing. [turns on the heater to 85 degrees] It'll be uncomfortably warm, but you will get a male child.

[@landawille7088]

Ah yes, baking a child

[@chrisrse.7458]

why are they having sex in the doctors office

[@saltedfissh]

@@landawille7088 hmmmmm nice smell

[@Versuffe]

@@landawille7088 like mum said when you were 4

[@jaytb5815]

Is this actually possible, and if so, is it practical?

[@thunderchungus9971]

Bro is god removing us in the next update

[@PRAYINGMANTIS.]

Frrr

[@onyxjade5474]

Hopefully so .. fingers crossed

[@thegoldensuperior1863]

​@@onyxjade5474 Femcel?!

[@ReneeJoan]

Sexual reproduction is energetically very expensive compared to asexual reproduction (how bacteria reproduce, by dividing - offspring are thus genetically identical to the parent). However, in exchange for that intense expenditure of energy and resources, offspring are genetically diverse and differ from each other and the parent. This results in enhanced adaptability to changes in the environment and superior survivability of the species. On the other hand, in times of scarcity or famine, sexual reproducers are at a disadvantage, and asexual reproducers have a better chance of surviving. If the Y-chromosome dies out and reproduction becomes asexual, our species might have trouble surviving. So, how is this relevant? Well, if climate change results in global scarcity, that could affect fertility and reproduction.

[@naikjoy]

Do you think because I can't get a girlfriend.. that my Y chromosone is kinda..........deteriorating but if I had one and had sex a bunch... be more physically active..have less stress be more under daylight rather in front of the PC.. eat some better stuff, wear better stuff... not use shampoo or something to clean myself my Y chromosone going on and on (if I procreate ofc).. would remain okay? ................. this only depends if all of the above is correct?

[@daidipyaa]

​@@naikjoythis has got nothing to do w u and hass to do w humans as a species. Can u talk w some sense,because what ur saying clearly isn't making any sense.

[@Danymok]

Y chromosome is not small, it's definitely average size

[@lukyboi_4450]

y-yeah.. its quite average- actually a little large actually... very large...

[@donottrustanyonelol]

my y chromosome isnt small, i just took a cold shower

[@benjaminmathew289]

@@lily_lotus_queen clearly u did not grasp the reference

[@NaraOfCambodia]

@@benjaminmathew289 Pokemon X and Y?

[@benjaminmathew289]

@@NaraOfCambodia 💀nah

[@coldsobanoodle7407]

There is another interesting species that has lost the Y chromosome in males known as the Amami spiny rat. Of course they have a different sex determining factor in place in the absence of SRY from the Y chromosome. In males there is a gene that turns on zinc finger proteins in order to turn the undifferentiated gonads into testes.

[@nilo70]

The last part was hot. :)

[@TheMuffinator3]

@@nilo70 you like the sound of those zinc fingers? 😏

[@f.b.lagent1113]

there wont be such change on humans, our “Darwinistic natural selection” is considerably slowed by globalization, losing Y chromosome is neither completely beneficial nor determinant to modern survival, we wont be mutating anything like these examples in the video why for millions of years that have never happened to any Apes but we Homo Sapiens will? this is delusion

[@byronrobbins8834]

@@TheMuffinator3 if only Mr Bennett used a Y, then they would have had a son for the estate to pass onto, and his wife would not have demanded a marriage.

[@TheCharleseye]

Yet another lost the Y in just the last few generations. They now determine sex based on how badly they want to be trendy.

[@ernestortiz4555]

This is why science is what I choose to live by. Science is fluid, not rigid. When the information changes, the conclusions change. Basic, simple logic that works very well. Tangible things that can be tested and real world results that can be confirmed.

[@rabbit_turtle]

I think there's a huge misunderstanding in the comments section. Male is NOT JUST y chromosome. Males are X+Y, while females are X+X.

[@jordanreeseyre]

Scientist: "At last! A simple system that explains sex determination." Evolution: "Laughs in biology"

[@savedbygrace2940]

What are you talking about? Science has killed the theory of evolution. That’s all it has ever been, a theory, not proven fact. The truth is, Ezekiel 37 was fulfilled in 1948 when Israel became a nation in one day. The next two chapters are coming after the rapture of the church. Believe Jesus died for your sins and God raised Him up on the third day, just as you will be raised up on the day of the rapture when the dead in Christ rise first then we who are alive and remain will be caught up with them in the clouds. We are the fig tree generation which means we are the rapture generation, started 73 years ago, the generation is almost up, we’re going home soon.

[@coldfire774]

@@savedbygrace2940 what do you mean the theory of evolution is one the most tested and concrete scientific theories out there. You probably don't understand that to be a theory in science it has to prove things by itself it should be able to predict what will happen and it has time and time again. Spontaneous speciation has been observed countless times evolution predicts that that should happen and it did. Theory's are tested and remade based on the accuracy of their predictions. It's adapted a bit since Darwin's time yes but that doesn't mean science killed it. It's still one of the most well tested and most believed theory's out there if you don't believe evolution I worry for your critical thinking skills we have over 50 years of good solid data backing up evolution.

[@nickvarley8365]

@@savedbygrace2940 What are you smoking? Evolution is very much proven.. but blabber on all you like if it makes you feel smart..

[@savedbygrace2940]

@@coldfire774 There are different descriptions of evolution, I am not disputing genetic changes and adaptions to the environment. I am disputing macroevolution which is not a proven theory. With speciation they separate into groups adapted to different environments, but overall they are still the same kind. Take the finches for example, they are still finches, and beyond that they are still birds. We find a variety within a kind, but we have never observed one kind become another. And the fossil record and living biodiversity don’t have any indication of transition stages of features, we see fully formed features like feathers and wings, very complex structures. Tell me why all fossils are already fully formed creatures, and there are no living organisms with almost functional features. All observed genetic advantages gained, suited to a certain environment, are degraded genes that change a feature. Like a long beak gene breaking and causing a shorter, stronger beak that can break harder seeds. And God designed every living thing for more or less the same environment(Earth), so for things that need the same kind of function, there is no need to invent entirely new code for those structures. That is the reason for so much similarity within dna, codons make peptide sequences, most of the sequences necessary for life are the same. Then there are genes that code for inheritable features. Mammals have bones and skin, muscles and so on. Each are similar, but slightly different, the dna would be mostly the same but a little different. Same designer, not common ancestors.

[@coldfire774]

@@savedbygrace2940 what about the boney fish (no not dolphins and whales) they are technically "mammals" genetically but tell me a lung fish is the same "kind" as a horse and you've gone off your rocker. And yes we do notice in- between stages in the fossil record especially the transfer from cartilaginous fish to terrestrial animals. A lot of the work done now is done using genetics as a basis so I'd really recommend looking into that because the connections we have made go counter to what you'd initially expect but they are fascinating.

[@dreyhawk]

Two other interesting genetic setups are 1) several aquatic creatures change sex when needed, like Clownfish where each school is headed by a matriarch. When she dies the dominant male changes to female and takes her place. And 2) Some reptiles reproduce without contributions from a partner. Mourning Geckos are especially known for this as there are no males at all. The gecko reproduces by Parthenogenesis. It's been seen in some other lizards and some snakes. This is why I love science! There are so many variables and permutations. It never gets boring!

[@mattbosley3531]

I've read about cases of sharks reproducing by parthenogenesis as well.

[@theoverseer393]

Complexity makes this an extremely difficult human ability to perfect. Not for clownfish tho

[@kdjoshi726]

1) isn't that's what oysters & mussels do too?

[@kdjoshi726]

@@mattbosley3531 Aren't sharks intersex tho?

[@christopherfleetwood5252]

Now we know why Marlin was trying to Find Nemo!

[@guyperson1653]

I love the amount of people here in the comments who obviously didn't finish the video

[@esc8237]

Some philosophers said that females were incomplete males, but it seems that males are incomplete females XD

[@arga400]

Fun fact, if a XY human is missing the SRY gene they develop as a female and they are able to give birth, completely indistinguishable form other XX females However if an XX human gains the SRY gene they develop as a male however they are infertile because the production of sperm is encoded in different genes within the Y chromosome, which they don't have. EDIT: There seems to be some confusion, XY humans who lack an SRY gene are not hermaphrodites, transgendered, futanari etc. They are indistinguishable from XX females, your own mother could be XY and you would never find out unless she got a DNA test. This is because all the information to become a women is in their X chromosome.

[@BLOODKINGbro]

Futanari on the raise!

[@fancen]

@@BLOODKINGbro hot

[@Artifying]

I didn’t know that there were intersex people who could reproduce! I’d only learned about the chromosomal combos that result in a sterile person. I love learning.

[@andromeda7758]

There's also times when people can have an extra chromosome or have only 1. XXX, XXY, XYY, X, Y. it goes on. It's much more interesting than my catholic school biology class made it out to be

[@kelleren4840]

Yup! I loved sci shows "there are 24+ biological sexes" video. Humans are fascinating!!

[@Ming1975]

A platypus, something that god decided to make instead of a griffon. God: Hmm, eagle/lion... Naw let's just make Duck/beaver.

[@linkholder]

If God gives us Griffons, it's all over for y'all.

[@SpiritLife]

True!

[@colinjohnson4799]

/snake

[@GamingMasterAnthony]

That sweats milk.

[@SpiritLife]

@@dinosore4782 He's very real. Here's proof: kzbin.info/www/bejne/g3LOhpRreN9khc0

[@tonystout9118]

Good heavens. Male and female. Stop with the madness already.

[@WhatTheKel33]

wah wah wah boo hoo 😿😿😿

[@tonystout9118]

@@WhatTheKel33 noises? How about a defense?

[@WhatTheKel33]

@@tonystout9118 booohoo wahh 😿😭😢😢😭😿😭😿😿

[@ncolvin05]

It's not the size of the chromosome, it's how you use it.

[@starshine3588]

So basically….the Y chromosome won’t be around forever but will be around for at least many thousands of years because it would take that long for the Y chromosome to evolve smaller and smaller until it disappears.

[@williambennion7423]

It's a hypothesis still. The Fragile Y-chromosome hypothesis. There are regions of the Y-chromosome that are very stable but the increase incidence of Y-chromosome aneuploidy might favour the fragmentation of the Y-chromosome in either translocation and fusions or a gene moving off the Y-chromosome. It's just a hypothesis.

[@icarusunited]

Human will most likely evolve by that point and we would be considered not modern anymore.

[@B.D.E.]

More like millions of years, by which point 'we' won't be homo sapiens anymore anyway.

[@Casanuda]

Predicting the future of evolution is akin to predicting the weather in 10,000 years for a specific Tuesday. You assumptions will be based in present trends and ignore the factors you cannot predict to come up with possible conclusion based upon present trends. In other words, we don't really know and this conclusion isn't really science.

[@brandokish6001]

@@Casanuda yup who knows what the coivd vaccine will do to our dna. I got it and now I can move things with my mind.

[@howdy4504]

"Life uh...finds a way"

[@mysticalpie4695]

No scientist mess with the human DNA

[@jjnix9517]

For humanity it simply means our species will end

[@spatulaman2753]

Nice reference!

[@jjnix9517]

@@SirNeutral some species can change sex, humans and most mammals can't

[@Cybeonix]

Needs more "uh"s

[@Kodabeahr]

Soooo. The future IS female. Cool.

[@thegoldensuperior1863]

🫵🤣🤣🤣🤣

[@queerantine69]

The world is weird...and I'm here for it

[@roniusadethel9768]

Of course the platypus would be a maverick.

[@alexandercanella4479]

Cant trust em'

[@madcheshire240]

@@alexandercanella4479 Google doesn't think the comment is English lol. When I clicked "translate to English" it changed to "Can't trust me" lmao.

[@pillowprincess3673]

@@madcheshire240 i just did that as well lol

[@PabloSanchez-qu6ib]

@@madcheshire240 no puedes tenerles confianza.

[@razi_man]

X: Did someone say "maverick"?!

[@SHINeegirl501]

this all gets even more wild when you get into reptile/amphibian reproduction. mourning geckos are almost all female and while they reproduce asexually, if there's more than 1 together they're more likely to lay eggs bc they will sometimes "mate" with each other and trigger each other to begin reproduction. and even though offspring are all technically clones of their mothers, mutations will sometimes create different features and there are rare occasions where they hatch infertile males! listening to reptile experts talk about genetics is always so interesting, nature is seriously so cool!! and the existence of some males along with there being distinct lines of genetic clones within the species implies that they used to reproduce sexually with male + female chromosomes and the male genetics died out (maybe similar to the y chromosome degrading), leading to the remaining females changing how they reproduce! reading about the exact process makes my head spin a bit so i won't try to summarize it as a non-expert but it's worth looking it up if you're interested in stuff like that lol. and this is why though i like mourning geckos i will not get one until i could handle breeding bc they will do it whether i want them to or not lmao!

[@Pandalka]

amazing

[@raincandy1653]

I want to clone myself like a mourning gecko...

[@animeluver22113]

@@raincandy1653 why 😳

[@raincandy1653]

@@animeluver22113 bc that sounds less painful and dangerous than childbirth

[@user-yi4mt4hp8u]

@@raincandy1653 artificial wombs will solve that

[@rolandfelice6198]

Thanks. This was a super interesting video. I sure learned a whole lot today!

[@Sadcvm]

*"Can you define gender?"* *Everyone*: "Uhhhhh" *Sci-Show*:

[@infenvr]

they defined sex, not gender

[@Sadcvm]

@@infenvr spoken like a true confused teen

[@infenvr]

@@Sadcvm I’m not confused lmao, you’re the only one that’s confused, and that’s okay, you can learn!

[@nilnil8411]

​@@infenvrsex and gender is basically the same until so lib college professors decided to change the definition of gender.

[@XENOXTA]

As someone with two Y chromosomes, genetics and it’s variation across animal species never ceases to amaze me.

[@TheRealMooHamHead69420]

Does that make you a super male?

[@XENOXTA]

@@TheRealMooHamHead69420 Exactly! I am a god amongst men...

[@dragonbro5532]

Couple: "What's the gender doc?" Doctor: ... "Chad." Couple: 👁👄👁

[@Silverfirefly1]

That's bad luck man, I hope you haven't had to struggle too much. It's like rolling the dice.

[@CatgirlKazu]

Do you mean XYY? I don't think you could even properly develop into a human without an X.

[@claudehebert3131]

Yes, it's weird, and you didn't even touch the weirder parts; sequential hermaphrodism, unstable sexes (animals who can change sex during their adult lifetime due to environmental factors), haploid trees (conifers) and ferns, while their "gametes" (spores) are diploid, plants with more than 2 sexes, etc.

[@Poodleinacan]

Hermaphrodites, when an abnormality to a species, is a malformation.

[@crashman4483]

Trees are not animals. That's just not how any of this works.

[@worldsfunniestvideosandbes3684]

IKR. I know that some fish species do this.

[@blumoogle2901]

Yup, I have even heard of a type of deep ocean mulusc with seven distinct sex chromosomes, and every possible combination expresses different physical traits, only some combinations of which are mutually fertile, and the methods each sex use to have offspring are distinct too

[@julesthecat.]

Nature is whack

[@Bubbles13287]

As a molecular pathologist that literally STUDIES DNA, I find this abhorrent. The Y chromosome contains the SRY gene that is NECESSARY for male sex development. This is not fluid. Sex aneuploidies are perfect examples of role of the genes on the Y chromosome. Z and W chromosomes are used in birds (which are REPTILES - NOT mammals) and only in poikilotherms (REPTILES - also not mammals) such as crocodilians does temperature play a role in the pathway of sex determination. I have absolutely no words to describe how I feel right now. As a scientist and healthcare professional that specifically specializes in DNA and RNA research, I cannot let this stand without commenting on the blatant inaccuracies. I didn’t spend years upon years studying molecular cell biology so you all could indoctrinate people that have never had the opportunity to learn about DNA in more detail. Totally dishonest, and extremely disappointing.

[@drawing-ology]

Sir can you explain what sex aneuploidies means .. just a bio student in 11 ... curious... yk

[@proudfatherofadeadweightso5715]

@@drawing-ology sex aneuploidy is basically a change in the diplogametic structure of your chromosome be it allosomes or the others , basically some people are born with xxx or xyy , these are underlying cases of sterile or hormonal deficient people who don't even fall into a gender but should be treated as uncommon genetic abnormalities , the other guy is right as a zoology major this video is straight up over the top nonsense. You can't use sterile exceptions to dictate the common genetic structure

[@drawing-ology]

@@proudfatherofadeadweightso5715 ohh got it that means its a term for rare genetic condition with abnormal chromosome distribution... ok thank you sir for sharing your knowledge.....I'm really grateful to both

[@proudfatherofadeadweightso5715]

@@drawing-ology it's not uncommon in plants per say much of the high quality wheat you eat is from polyploidy ( where one set of chromosome occurs in pairs of more than two) but that's not the case in animals Also you're welcome

[@drawing-ology]

@@proudfatherofadeadweightso5715 hmm thus the dominating within the two alleles determines its traits for such wheat....

[@vmann8168]

Some people are actually offended by this video. The goal of science isn't to appeal to your values, it is to understand the world.

[@XenXenOfficial]

"Yo doctor I've had 6 girls, I want a boy. Could you help me out?" "Aw-yeah dude. It's gotta be that right nut. See like.... I'm pretty sure the right one makes boys. If we remove the left one, the only option is to have a boy." "Sounds 'bout right."

[@thelordnaevis4946]

Some people actually did that in the 9th-11th centuries

[@captainclarky5352]

@@thelordnaevis4946 Did it work?

[@thelordnaevis4946]

@@captainclarky5352 obviously *not*

[@electronresonator8882]

I hope the guy didn't try to rubber band his left testicle a month before procreating his wife is like "wtf is this blue ball !?"

[@hhiippiittyy]

My left or your left, doc?

[@typograf62]

It's kind of interesting that the sex of tortoise fetuses can be set by turning a dial on a thermostat. And worrysome as the global "dial" goes up. Male tortoises may become rare and much needed.

[@danielharvison7510]

*sigh* There goes the species. Thanks, humanity!

[@davidclaudy4822]

So… just blame globull warming. Dye your hair green. Put on 200 lbs and you’ll become asexual by choice. Good luck with that.

[@typograf62]

@@davidclaudy4822 I'm not a tortoise.

[@davidclaudy4822]

@@typograf62 Well that’s a relief. With the feet the tortoises have, you’d be awfully talented to text on a phone or type on a keyboard.

[@dogmosatchmo]

I was a reptile breeder for a few years, and it effects many species. If you set the incubator at a certain temperature, you can almost guarantee what the outcome will be. Especially with lizards. But many snakes can be manipulated with temperature.

[@davidparker2173]

I thought sex was supposed to make us blush. It is the age we are in, but that changes too.

[@iamjoris]

The system where you get a female after fertilisation by a male is really interesting. It means there is a feedback mechanism on the ratio of males to females, probably leading to some kind of balance . If there are no males, no eggs get fertilised and a lot of new males get born. If there are a lot of males, most eggs get fertilised, leading to more females. I can imagine this being beneficial for the species if there is some kind of external factor that regularly leads to an imbalance in the male to female ratio. Very clever, evolution.

[@victordonchenko4837]

@Talsong Kingslayer He's talking about bees.

[@nichsulol4844]

@@victordonchenko4837 we lost source of two only is a water and food source y

[@spfein]

It seems throught my life girls were born more than boys still seems this way today at least here in america

[@syasyaishavingfun]

@@spfein nah, look at the statistics. More boys than girls are borned.

[@IncendiaT1990]

I can only imagine how bad that would be for us females, as far as how we'd get treated. 😰

[@ninobindel9425]

It would be interesting to see if ZW-system frogs can still mate with XY-system frogs.

[@jenitoten2212]

That was my question as well. And would the off spring be XY or ZW?

[@karsten69]

@@jenitoten2212 or XW

[@BudgetNugs]

@@jenitoten2212 or ZY

[@FWU100]

@@jenitoten2212 or XZ

[@NeostormXLMAX]

This is a very interesting question

[@protectork9831]

Sounds like gender is fluid.

[@Alinafe]

no, did you listen at all to the vid? the sex determining action is fluid, there are still 2 sexes

[@SolarDelite]

@@Alinafe technically more than 2 due to intersex

[@sigstenbockgard8080]

@@SolarDelite a rare genetic anomaly which often leads to being sterile isnt a gender

[@adrianpaligar2026]

I can't believe scieshow needs to explain the word female and male.

[@catevan.the-]

you mean you can't believe that a science channel did a video about a scientific subject?

[@eriknicholas7294]

"And THEN there are animals that completely throw a wrench into this neat two chromosome system..." -Rose Bear Don't Walk "Ah, if it isn't [the] platypus... What an unexpected surprise... And by 'unexpected', I mean... COMPLETELY EXPECTED!" -Heinz Doofenshmirtz

[@lindseyariegel7703]

can we all just agree that the platypus was just some crazy experiment during whatever was involved with creation and it was just so cute they kept it around.

[@tammystockley-loughlin7680]

My theory...a duck and a beaver and the nicest nest/lodge and maybe a solar eclipse, lol. Positive vibes from New Hampshire, remember to be kind to each other and yourself during this pandemic and social crisis

[@DomSum7]

I concur. Now I want one. I’ll have it be my support animal.

[@dionysusnow]

Why would an omniscient god need to experiment?

[@tammystockley-loughlin7680]

@@dionysusnow that might be a silly question.

[@clayton9136]

Imagine that. God talk on the scishow

[@curiouswind9196]

If you told me platypusses can shoot lazers like a kiwi or teleport I would not be surprised

[@BrianJNelson]

I've been told it's not the size of your Y chromosome, it's how you use it.

[@isaacprete6786]

The Ben Shaprio fanboys won't like this one lmfaooooo

[@007kingifrit]

why? we aren't "other species" and this is a discussion of sex. not the pesuedoscience of gender you still don't get to pick your gender

[@melodymcdaniel9268]

@@007kingifrit Because people are stupid and will still see this video and equate it as having to do with trans people

[@pemdemica1712]

@@melodymcdaniel9268 Here's one Ben fan.

[@melodymcdaniel9268]

@@pemdemica1712 huh???

[@angrybellsprout]

@@007kingifrit you could feel the fear in her Everytime she had to say that sex had to do with sperm and eggs.

[@mrdraw2087]

The theory that the Y chromosome is slowly degrading is pretty old, but I thought more recent research suggested it may not be as unstable as we thought. The fact that most mammals still have this XY configuration suggests to me the Y chromosome may not be doomed. Moreover, if the Y chromosome goes extinct, and other chromosomes take over the role as X and Y chromosome, wouldn't females then be left with just an extra chromosome as well?

[@ginagetscreative]

Well other animals have different numbers of chromosomes so it really is more an individual species sort of thing and not a "hey they still have a Y going on". The Y chromosome may disappear it may never disappear. I would suspect at some point it was basically another X. The question would be what do the genes on the Y actually do? Are they redundant?

[@mrdraw2087]

@@ginagetscreative At the moment the Y chromosome isn't redundant, it has some unique genes. You would think that evolution would prevent the loss of these genes, as males without a functioning Y chromosome can't reproduce. But what if the Y chromosome still becomes redundant? Then we may end up with essentially the XX-X sex-determination system. Nature probably finds a way to make that system work as well. Otherwise maybe other chromosomes will take over the role as sex chromosomes, which is quite cool I think.

[@kenji214245]

Also our Y chromosome is still changing and evolving and has changed a lot in the past 1000 year alone. Might go evolution instead of degradation if we are lucky 🤔

[@kissit012]

No. The X chromosome is not dependent on the y. The y, however, is dependent on the x

[@toomanyopinions8353]

I think if males lost the Y, then every sperm would have an X.

[@sandro5535]

Heard of a few species that got 3 gender chromosomes leading to more female to male ratio.

[@EzioAuditore]

More women than men and we still have to make the first move

[@2009mouser]

"You could talk all day about this kind of thing." Go on, I'm listening. This is fascinating

[@Xeridanus]

Clown fish are all born male then one becomes the dominant fish in the colony and becomes female. If she dies, another male takes her place complete with sex change. Finding Nemo didn't just have a dad, he had a dad who was transitioning into his mum.

[@bananawitchcraft]

I'm not studying biology, but I already knew about ZW chromosomes from falling down a Wikipedia rabbit hole about it, bc wow that is so weird and cool

[@0815UserII]

And you didn't even get into how the genotype isn't even the end of the story, as the phenotype also depends on the hormones present during development, making it possible to have XX genotype but develop phenotypically male, or vice versa. Or clownfish, that can change during their lifetime if the situation demands it.

[@abandonedmuse]

I just wrote a comment about this but I had forgotten the exact species. Thanks!

[@o1ivi493]

Trans people!!!

[@THall-vi8cp]

Chickens are strange. A genetically male chicken egg incubated a bit outside the proper temperature range will flip and develop into a phenotypically female bird that is still genetically male and will only give rise to male offspring. I had a couple of my easter egger chickens do this - _all_ of their offspring were gorgeous roosters. Eventually we stopped hatching their eggs.

[@emmahardesty4330]

Great. Wish this could be shown in ALL schools. Wish this topic was a series.

[@owowPOV]

5:37 'egg-laying mammals of action' I laughed way too hard than i should...

[@netro4680]

I'm not quite sure of this but I heard that the original creator of the show actually created the song for Perry the Platypus just by going to Wikipedia for platypus and found the 'egg-laying mammals of action' sentence and use it as source of inspiration for the song

[@weirdkitty07]

They didn't call those worms oedipus worms? Missed opportunity there.

[@andromeda7758]

Truuuueeee🤣🤣🤣

[@xenasaur520]

be the change u want to see in the world u can absolutely just start calling them oedipus worms and maybe it'll catch on

[@waterunderthebridge7950]

By that logic, there’s be a whole lot of Oedipus animals (clownfish as another example)

[@curlygurly2112]

@@waterunderthebridge7950 Oedipus was a clown to be fair 🤡 maybe they should be oedipusfish

[@jenitoten2212]

Hahaha that's hilarious

[@gromswowguide7927]

This is a theory, there are no answers to yet, but people talk about this like it’s a proven fact.

[@moritzl4024]

That myth was already debunked in 2014. The y-chomosome doesn’t deteriorates, it’s information was trimmed down to the essential. That’s natural selection. And the reason for the y to be so much smaller than the x.

[@Tytoalba777]

Oh my god you actually threw in a Perry the Platypus reference.

[@proculusjulius7035]

Perry the Platypus?🤠

[@jamesolelo4406]

Where?

[@gamezob]

@@jamesolelo4406 5:30

[@rylamistrandall6517]

Nah dude, the song writer actually took the line from the same wikipedia page of Platypus

[@123TeeMee]

2:24 I guess no man wanted to remove one testicle to test the theory

[@jameskuyper]

I would be surprised if no one ever tried that. There's far too many people who care, far too strongly, about the gender of their children. I would suspect that the results of most such "experiments" were ignored, and the ones that weren't ignored are the reason why that belief eventually died out.

[@aguynamedsmith6489]

My Y isn't small! It's average size and fully functional!

[@g4do]

Just because you say it , and mean it with all of your heart feelings and emotions... doesn't make it come true.

[@DeadlyPlatypus]

Wouldn't the fact that those Japanese frogs have different sex chromosomes prevent them from bearing fertile offspring, meaning they aren't the same species?

[@roguegreyjedi]

I would also like to know this!

[@patrickmccurry1563]

The definition of species is quite a bit more complex than "can they mate".

[@matheuscomp]

I'd guess they're closely related species with a known evolution history determined by geography, but sorting species out is complicated and stuff so idk

[@garrett6064]

That may be but if you look up the definition of species they all mention being able to breed and create fertile offspring, so it's pretty integral.

[@ragingfirefrog]

Species defined that way doesn't always work. Ring species are an example of how this definition breaks down. To put it simply, lets say we have five groups of animals A, B, C, D, and E. A and B can breed and have viable offspring. Same with B and C, C and D and finally D and E. However A and E can't breed with one another. If species is only determined by if they can breed with one another, are A and E the same species? You can argue both ways for this. There are a group of salamanders in California that are a ring species. There appears to be over a dozen other examples as well. Nature is very rarely cut and dry. Especially when it comes to life.

[@karthikcmohanyt]

So anyone with Y chromosomes can be called an ‘Ancient-One’ .

[@abydosianchulac2]

And anyone without Y chromosomes can be called a "Survivor."

[@hafwan5851]

"i am legend"

[@haroldwilkes6608]

@@abydosianchulac2 For one generation...

[@DeadlyTinyOrc]

Yea or just not the strongest species

[@haroldwilkes6608]

@Robert Brown Considering what passes for faux-women now, don't bet on it. Still, it's a good reason to send your sperm bank deposit through the microwave.

[@kalel4677]

X chromosome: Grrr those damn Y chromosomes, I hate them so much. Y chromosome: Why what did I do? X chromosome: You simply exist, can't you just become an X chromosome I (think) am so much better than you in everyway, it would be better if you were just like me, so can you just like umm stop existing? Y chromosome: Oh you're so funny, but sorry to say we exist to cohabitate together, you wouldn't be able to make more of you if it weren't for me, so pipe down there.

[@livingthelava]

Brilliantly delivered.

[@stevenclark2188]

Also there's that part in humans where the SRY can rarely allele-swap during meiosis onto an x chromosome and you get a male with XX.

[@Abel1120]

hey... how is your day going?

[@katefletcher5838]

Would that lead to decreased reproductive function in the male then? Or possibly display certain female features or some level of hermaphroditism?

[@rainjaydd8213]

@@katefletcher5838 not always, that's up to a bunch of other metrics like receptor pathway spread I have XXXY, and my anatomy is mixed - most people with XXY don't get mixed physiology, so it's up to more than genes, but genes play at least some role

[@NadDew]

@@rainjaydd8213 so what type of gamete your body produces if you don't mind me asking.

[@DarkMage2k]

@@rainjaydd8213 you might have overall male body but with 2 Barr bodies? I'm interested to know about you. Tell me.

[@TheTexas1994]

I'm sure this comment section is going to be completely civil

[@Sebaz.]

good lord why are people going mental in here. I have no idea

[@jackielinde7568]

Civil? Probably... Not working blue? Are you kidding me?

[@mugenokami2201]

Lol

[@gomahklawm4446]

@@Sebaz. Presenting a HYPOTHESIS as factual as they did is pretty crappy for a science channel....

[@VoltieBird]

@@gomahklawm4446 They didn't present it anywhere in the video as anything other than a prediction. I wonder why you're so motivated to be upset by this video...

[@hulax9858]

I think the Y chromosome is average size, it almost looks big in certain angles actually

[@darwin6883]

hahahah

[@dogbert02]

That perry the platypus reference is why I watch this series, informative but willing to make you laugh.

[@gtbkts]

Same

[@katrinahockman5561]

Scrolled down as soon as I saw it to see if anyone else caught that, hah..

[@dexterman6361]

Where? I missed it

[@joshuabenedictj]

@@dexterman6361 5:32 , It is perry's theme song.

[@smssalina]

Hanks shirts make me laugh.

[@gildedbear5355]

And this episode doesn't even cover hermaphroditic species or species that change sex over the course of their life, either because of age/size or social interactions. Nor does it cover chromosomal or developmental abnormalities where you've got too many (or not enough) sex chromosomes, or the ones you do have fail to develop normally. Sex determination is like color theory, as you learn more it alternates between seeming simple and impossibly complex 8)

[@roguegreyjedi]

+

[@zeepluto]

Wow you’re right 💯🤝

[@coolroxas]

That's a different video Edit: link- kzbin.info/www/bejne/oYWTeX2hp5adoJY

[@LimeyLassen]

Don't forget parthenogenesis! And there are species that can switch back and forth.

[@SAKEENAHNYC]

The Y chromosome is dying bc men are too busy trying to be better women than women & the foods that are being consumed are very high in estrogen

[@johnthumble5154]

Trying? No they are being better at being woman 😂

[@cimbakahn]

Research shows that if a sea turtle's eggs incubate below 27.7° Celsius (81.86° Fahrenheit), the turtle hatchlings will be male. If the eggs incubate above 31° Celsius (88.8° Fahrenheit), however, the hatchlings will be female. Temperatures that fluctuate between the two extremes will produce a mix of male and female baby turtles. So, Aristotle wasn't 100% wrong, just different species.

[@jasonwebb1882]

I had a snake that was in an enclosure by herself. She was one my favorite animals I had too. After I had her for 3 years, she popped out a complete litter of baby snakes. A real virgin birth and it threw me for a complete loop. Now this is a highly venomous snake and I am the only person that cleans and feeds her. So I'm sure that my wife and kids didnt put her in with a male. I called one of my friends that worked with snakes and probably knows more about snakes then I ever will and this here proves it. I asked him how in the world did my snake get prego man. He said that if a snake wants too, she can pretty much clone herself to give her species a better chance. This happens all the time and it just was the first time it happened to me.

[@DavidMBebber]

Regarding the part about species naturally transitioning between different sex chromosome models (such as XY to ZW), wouldn't this make them a different species? ...true, they may still have the same physical appearance, but they (the ZW animals) would no longer be able to interbreed with the original (XY) animals. Right?

[@spookyblush-speedruns]

What makes a species a 'species' is determined by how people decide to catalogue & label them; a system that is changing over time. There are subspecies & even microspecies, depending on what part of taxonomy you look at. In fact, there's a lot of debate about whether the current mainly used taxonomic system should be entirely replaced.

[@mg4361]

If you take look at bears, brown, polar and both species of black bear can crossbreed and produce healthy offspring. In case of brown x polar this happens in the wild whenever they come in contact and we know that the offspring can reproduce further. Still we consider them separate species. I agree, the species definition isn't as simple as "can they reproduce of not?". However, if two groups CAN'T produce fertile offspring, i would say that it is a pretty strong argument against keeping them in the same species.

[@AndreaCrisp]

@@mg4361 wolves and coyotes have interbred as well to create a new species, the coywolf.

[@iniminimoshimo]

she mentions that there's usually a transition period while the switch happens so I assume there must be interbreeding? like the whole species can't just switch to ZW in one go. they still largely serve the same functions so

[@DavidMBebber]

@@AndreaCrisp there is some speculation that the Red Wolf is really just a misclassified coywolf... That would mean that this hybrid has been around for a very long time.

[@circuitsandparts]

Two instruments led to modern Science: The Telescope and the Microscope.

[@silverbackag9790]

This is how we become Grays. And have to travel back in time to create hybrids.

[@angeluslupus]

5:28 A platypus reference? 5:31 A PERRY the platypus reference!?

[@karlkun717]

Fun fact: Y chromosome is not the real gene that creates a man, it is a gene called the Sry gene that makes a man which is normally located on the Y chromosome. As long as a fetus has the sry-gene and it is fully activated, then it will almost certainly 100% grow into a body with male gonads even if there is no Y chromosome.

[@Demonetization_Symbol]

So can an XY be a girl if there's no sry gene?

[@Demonetization_Symbol]

She literally mentioned the SRY gene

[@uwucummies2483]

Ur not a real man u dont have xy chromosomes / j

[@syweb2]

Chromosomes aren't genes, they just contain them.

[@manifest2203]

Useful info. Thanks.