Biol 181 Lecture on how to use parsimony to evaluate phylogenetic trees.
Пікірлер: 58
@Anthony-dy2cv2 жыл бұрын
GOD BLESS YOUR SOUL. I was searching everywhere for a video that could explain this but they were either too hard to understand or too high level for me to comprehend. But this was incredibly straightforward and motivating. Ma'am you are an amazing teacher.
@mafnoor6 ай бұрын
Perfect-- just the supplement I needed for my class-- thank you!
@jessicalv644210 ай бұрын
Amazingly clear!!!!! Thanks a LOT! Campbell biology didn't do the explanation better than you :) You're amazing!
@joshgialis28445 жыл бұрын
Very informative video! Thank you for the upload Dr. Claire.
@tatianaayala-delamatta51243 жыл бұрын
I usually don't have issues with biology, but this stumped me in my lab. You have single-handedly saved me! Thank you!
@soakable45002 жыл бұрын
hi im an ap bio student, and you actually made sense of this.
@Cinderthebeaver11 ай бұрын
Thank you ! 10 minutes before my test and I understood the tree but not the dna sequence matchin it ! ❤
@nupatowoch30632 жыл бұрын
Now here is an insight one.. Appreciate your hard work
@anwesasaha83216 ай бұрын
This is so beautifully explained, thank you ma'am.
@tilakdhoble22455 жыл бұрын
You are a Great Teacher...!! Thank you so much for this...!
@user-hi4wh4ye5x7 ай бұрын
Amazing job, Thanks
@Jessica-zs7be5 жыл бұрын
Now I can explain better to students, thank you
@hassannaser7112 Жыл бұрын
than you ,, from Syria
@mattashley13853 жыл бұрын
Incredible video, you made it so clear! Thank you!
@ameerrifai4408 Жыл бұрын
thank you Dr. Claire
@8nansky5282 жыл бұрын
I ADORE READING
@JVishGenX3 жыл бұрын
Best explanation. Thank you so much :D :D :D
@nobinrm4 жыл бұрын
This is so beautiful. thank u for such a great video.
@chandamitagoswami77454 жыл бұрын
Thankyou for the simplest explanation.
@aruntheeban1 Жыл бұрын
Very well explained!!!
@gautamkannan19094 жыл бұрын
Excellent explanation !!
@MJ-ye7dd2 жыл бұрын
This is the best👌
@BalthazarUhsus2 жыл бұрын
great video!
@sarahmartinez10216 жыл бұрын
you're a great teacher!
@aoifecartwright9915 Жыл бұрын
hi, if there was gaps in the sequence, could a site still be considered informative?
@tallulahbelle7886 жыл бұрын
hey! This might seem like a silly question but when you are talking about the ancestral state, how can you tell what that is without having a prior understanding as to which of the species have evolved most recently? thank you!
@dr.clairesays51046 жыл бұрын
It's actually not a silly question at all. We often assume that the outgroup shows the ancestral trait, however, this is not a very good assumption, because of course the outgroup has also continued to evolve since it separated from the ingroup. Sometimes you can use the fossil record to determine the ancestral trait for bony features. I've simplified the building of phylogenetic trees here considerably for an introductory class, but it actually quite complicated. In reality, it usually involves large data sets, complex statistical models, and very fast computers.
@svenakin7774 жыл бұрын
Great explanation, thank you!
@zeynepkurt28016 жыл бұрын
Superb !!!
@siddhirao83285 жыл бұрын
Wow I easily understood it thank you so much !
@kenmagee86904 жыл бұрын
Thank you so much !! Great explanation !!
@archasvityagi99973 жыл бұрын
DR. u have explained well. What about character weight when we have large no of species with their maximum available characters. I am trying with thirty morphological characters of 45 species using PAUP.
@dr.clairesays51043 жыл бұрын
Hi Archasvi! Sorry I didn't get back to you sooner. I'm actually not a taxonomist and I don't run analyses like the one you are describing in my research, so I am afraid I can't help you. I hope you were able to find someone to help you!
@simbiotic243 жыл бұрын
thank you so much for this.
@aarons.13493 жыл бұрын
Can I choose only 1 informative site to make the tree, even tho there are multiple informative sites I can choose from??
@dr.clairesays51043 жыл бұрын
In the real world you would use many, possibly hundreds of informative sites. The more sites agree with your proposed tree, the more confident you become in the tree. A single site does not provide a lot of support for a particular tree. Remember, all trees represent hypothesized relationships between taxa and we use all available data to provide support for the various hypotheses.
@francosantin16366 жыл бұрын
Very clear explanation :)
@mohitbhardwaj5430 Жыл бұрын
Hello Miss! Please explain the Neighborhood joining method or maximum likelihood method
@abdulkader71042 жыл бұрын
min 2:30 orangutangs are the out group se we assume that they have the ancestral trait, and then we can look for shared derived traits within the in group
@anirbanbanerjee94826 жыл бұрын
helpful for basic idea
@nadlinjustin88506 жыл бұрын
Thanks for explanation, but would like anther lecture on how to Generate a parsimony network in TCS software.
@ayaqz31444 жыл бұрын
thank you so much
@tarahclue67372 жыл бұрын
Thank you
@nancycamacho2744 жыл бұрын
So if the sequences was GGAT would that be considered Parsimony Informative?
@dr.clairesays51044 жыл бұрын
It depends on what the ancestral trait is. If the ancestral trait is A or T, then that data would indicate that the two species with G are more closely related. If the ancestral trait is G, then that would be non informative.
@mousumikhatun20025 жыл бұрын
Thank you... From India 🇮🇳
@mayurbiotech16575 жыл бұрын
Thnks mam, the sequence just next to the parsim informative sequence consisting of CCTT is also informative right?
@dr.clairesays51045 жыл бұрын
Yes, that would also be an informative site. In a real world situation, you combine data from multiple informative sites to choose the most parsimonious tree.
@Tchotch_ke2 жыл бұрын
In the third (G T G T) why is it not 3 but 2?
@dr.clairesays51042 жыл бұрын
The scenario I proposed was that there was a change from T to G in the ancestor of all the apes and then a switch back to T in the Gorilla lineage. Which is 2 evolutionary changes. You could also propose that there was a change from T to G in the human lineage and another in the chimpanzee lineage. Again, that's 2 evolutionary changes. I hope that helps!
@akr58635 жыл бұрын
Thank You....From India
@mianaman28424 жыл бұрын
thanks
@wherearetgepoank11173 жыл бұрын
You furgot to put Jesus in the tree. That going to be the raght one, tha one with Jesus in it. Yeah I’m totally kidding, that was an amazing video. You really took a complicated subject and explained it in a very parsimonious way. Kind a meta-and very brilliant. I wish you were my genetics teacher in college.
@niamcd6604 Жыл бұрын
EVOLUTION THEORY NEEDS URGENT UPDATES!!! YET, anyone in the academia is too scared to openly say that because of the eugenist people behind its crazy blind support for it.
@xuanlai64464 жыл бұрын
Is that how u r supposed to read orangutan??
@onikarutherford70213 жыл бұрын
I keep confusing this word with "persimmon" in my bio class 🤦♀️