GCSE Biology Revision "Alleles"

[@raheemraja8471]

This man is the reason why i pass my exams.

[@joelagyemang8315]

word

[@tiarashari3729]

@@joelagyemang8315 also wording 2 years later and did you pass?

[@darkspace1350]

3 years later, did you pass?

[@TheMestarit]

@@darkspace1350 question is will you pass

[@mbanlab]

From the point 1:15 onwards, he says ‘ear wax’ around every 8.6 seconds

[@majwaska]

w e t e a r w a x

[@the_official_ballbagman]

indeed

[@omaranisabriye1305]

y u m m y :p

[@megangutteridge3964]

wow, i counted 23 "ear wax"s in four minutes - impressive sir!

[@Freesciencelessons]

No problem. It's one of the very few conditions which is entirely genetic. Most of the common examples are not genetic so I won't use them.

[@zafranakram3098]

@@Freesciencelessons lmfao 😹

[@anguu3544]

​@@Freesciencelessons 😅😅😅

[@Aww549]

i have a baseline test coming up, and you have helped me refresh my memories in less than 2 days! thank you.

[@neokhotle9735]

Where has this channel been for my whole IGCSE!!

[@gordonhardwick5151]

Thank you so much for these science videos. One of my sons has just taken his GCSEs. We watched them and agreed they are brilliant. An elder son is just issuing a post-doc scientific paper on particular aspects of DNA. I am watching your videos again as I grapple with the complexities of his paper, and am appreciating your videos even more.

[@hotsal3060]

2021 GANG! WHERE U AT, THE HOT FOLLICLES!

[@RobloxGOD-ll7mb]

U PREDICTED THE FUTURE!!!!!!!!!!

[@eagle_4878]

This was a year ago cu

[@f1fan316]

hello

[@Robertski1802]

2024

[@audreya2791]

Thank youuuu saved this, it's exactly what we're doing in school right now!

[@randomsloths779]

BEST TEACHER EVER

[@adam1386]

Drinking Game: Take 1 shot every time he says "ear wax"

[@mesbahomar7554]

19 shots done

[@faiza2216]

my mum finished all the alcohol in this household

[@HR-xv1qi]

no thanks, i like my liver :)

[@musadukureh9114]

this is attempted murder.

[@oats367]

24 done fam

[@youtubemix3179]

Thanks a lot I formed a whole corse just from your videos and wrote them as notes

[@Beautifulpathway3]

same

[@maximusekon146]

Thankyou FREE SCIENCE LESSONS you have rekindled my drive to study biology

[@vannawong212663]

Thank you sir! Haha, the whole time kept thinking..why ear wax?

[@gunzbl4z1ng57]

Vanna Wong they had us going on about hairlines when we were doing this lesson

[@memelord9965]

lol

[@thomasih04]

We did eye colour.. like normal humans xD

[@Freesciencelessons]

Eye colour is controlled by multiple alleles and should not be used to illustrate crosses.

[@thomasih04]

Freesciencelessons ah right, good to know!

[@alyanjabran7213]

biooooooooooooollllllogy exam in the morning wooooohooooooooo!!!!!!!!!!!!!!!!!!!!!!!!!

[@amritaagnihotri3732]

me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@hish2827]

@lewis upton quite late

[@aidanshokobishi]

My exam is tomorrow morning I’ve accepted the fact I’m finished

[@bellayu2341]

Thank you so much!!! This video makes it soo much clearer!!!

[@OrangeFoxE]

i binge watch these

[@M7RAA]

Ok, heres a third person. They have one allele for wet ear wax and one allele for dry ear wax. 😂 Thanks Shaun, I really appreciate ur hard work.

[@des1dave618]

whose binge watching these videos one week before GCSE in order to cram revise 😭😭😭

[@husnainzaheer4241]

Day before😭😭

[@infinity8362]

got a biology mock tomorrow, will update tomorrow on how it went

[@infinity8362]

got the gcse now tomorrow 😂

[@ferax4598]

revising for 2021 exams

[@ultr4instinct719]

Leaving my mark for may 😮

[@ultr4instinct719]

I hope future me has revised 😅

[@immanfrancis3619]

2020 anybody

[@dudedil817]

2021

[@annieli1244]

@@dudedil817 lol

[@jeromegeorge9228]

2021

[@ali.mp3410]

Yep

[@hamse9460]

@@ali.mp3410 3 days after you ?

[@outlander271]

Very clearly explained.

[@mystic6970]

Thank you from Pakistan!

[@akshatkumar1684]

Congratulations for 💯 k subscribers.👏

[@AdamAdam-to7du]

tank ya laddy

[@danielclare2079]

very well explained, thanks

[@dacegravis1937]

Watching these day before my exam

[@joelagyemang8315]

this guy is a legend

[@ozzzer]

LOL, do it at 0.25x speed

[@mbanlab]

B T haha “EEAARR WAAXX”

[@comicsamsthegreat]

Thanks for making this video! :D

[@matthewthecoffeeguy]

Just watched that all a 1.75x speed and now understand alleles and genotypes fully... woah

[@kailenkailen]

2020, triple science bioloigy. Wagwan lads, I'm failing innit

[@lollytape6625]

Lol paper 1 is way easier

[@ea1766]

Lolly Tape ik

[@bidz3460]

Kailen Mann Wys g. Loool we’ll all fail w out dis brudda

[@miguel_6430]

good luck to anyone doing their exam in 3 hours :)

[@jasurbekturgunboyev8432]

thank you it was very useful

[@CleoMunzwa]

I got lost when we started talking about the dominant alleles.... how do you know which one is the dominant one

[@Freesciencelessons]

The question will give you information to work it out, or it will simply tell you.

[@husnanassir2497]

The start of the vid was good sir

[@dalmapeller2285]

I am aggressively making flash cards before a exam! :,)

[@rhysjones4130]

Good luck to the boys tomorrow

[@cringle2]

take a shot every time he says ear wax

[@shreypatel6535]

what are the best tips you have for science for when it comes to remembering all the key topics that we need to know (edexcel 9-1) triple science ???

[@dopetroller2724]

Air time

[@AdamAdam-to7du]

just have a good night sleep. roughly around 20 to 24 hours a day

[@mxrci106]

Adam Adam ur reply got more likes than the actual comment 😂

[@vishalkunarathne3409]

because of you iam able to do teats

[@probeatz8833]

hi , please can you make a video on classification.

[@Freesciencelessons]

That will be coming soon.

[@AdamAdam-to7du]

okay

[@sultanmustafa71]

@@Freesciencelessons you are a living legend. You have saved countless people from exam failure. Thank you sir. We salute you.

[@ahsana9793]

last minute revision

[@sehreenshah146]

I love you so much 😭

[@sizxi]

freesciencelessons4life

[@Ziad-cp3lu]

Out of all genes he chose the earwax, like why ?

[@gordonhardwick5151]

Watch it again - he did say.

[@maliyah8587]

Does every cell have a wet or dry earwax or is it just the cells in your ears. I’m CONFUSED!! I NEED TO KNOW I HAVE AN EXAM IN TWO DAYS

[@Freesciencelessons]

Every cell has the ear wax gene but the gene is only active in the cells of your ear canal.

[@tahmidchoudhury1013]

Freesciencelessons In a chemical equation do the big numbers represented the number of molecules or the number of moles?

[@Freesciencelessons]

They represent both. So they can be molecules but also, if you are working with moles, they tell you the ratio of moles taking part in the reaction.

[@tahmidchoudhury1013]

Freesciencelessons oh OK thx 😀

[@dwdwwdw8049]

how are the chromosomes copies if they come from different sexes and result in different characteristics.

[@Hannahlolz]

Omg THANKYOU so much

[@alishas7960]

thank you so much!

[@Freesciencelessons]

No problem and thank you for the comment.

[@jacoballton4511]

Trying to cram in for my exam in 3 hours

[@alexireade3408]

Jacob Allton dude....i hope your paper 1 went ok...coz this is paper 2

[@wooa2100]

at 3:28 will they tell you in the exam which allele is the dominant one?

[@Freesciencelessons]

Possibly or they might expect you to work it out from data.

[@wooa2100]

Freesciencelessons so would you look at the C c ?

[@t.stizzy928]

How am I only at this stage the night before the exam ffs

[@NitinKumar-hv2uu]

1:00 OOOOOOOOOHHHH GET ROASTED

[@bibeklimbu9456]

what?

[@zafranakram3098]

😂😂😂😂

[@coolguy-kx9df]

Lol out of any example there was such as eye colour, hair colour, but you choose wet and dry ear wax ?! XD

[@Hannahlolz]

Is the dominant allele always expresed as a capital letter?

[@joecrawley1301]

yeah and recessive is always lower case

[@chantelle5170]

yes

[@sunsetvlogs5500]

Yes

[@AdamAdam-to7du]

yes sir

[@soniasiddiqi1629]

i feel like this could have been a great vid but i was too distracted by the ear wax lmao.Why couldn't it be for like eye colour or something... nah jk this guy is a legend

[@Freesciencelessons]

Eye colour is not a simple case of Mendelian genetics. It is controlled by at least two different genes. It should not be used to illustrate genetics. Ear wax (even though it's unpleasant) is controlled by a single gene and does illustrate Mendelian genetics.

[@yarm71]

Freesciencelessons agreed there because Ear Wax is easier to explain because it’s strangely controlled by 1 gene. Although I understand your point he said Ear Wax about 20,000,000 times but it was still an accurate and informative video. Also I just realised that I’m 9 months late never mind

[@fallenout4times438]

How do you know if an allele is dominant or recessive?

[@LIGHTHITGAMER123]

Hi bro I am from India

[@kramstar4984]

@@LIGHTHITGAMER123 Who asked?

[@zal0133]

​@@kramstar4984 i did

[@andCo_]

Is there a way to change a person's Gene's or swap them with someone else's to change thier features ?

[@valeriovangraas1630]

I want to see a trap remix of this, called ear wax

[@abdi472]

im gong to miss watching your videos

[@c.o2307]

Do you have to know the different types of mutations?

[@Freesciencelessons]

Not for AQA. However, they could use that as an application of knowledge question, in which case they'd have to give you some information.

[@ghst_-hf4ol]

Is it random which allele is dominant or are they structured to be dominant?

[@Freesciencelessons]

Whether an allele is dominant or recessive is determined by the base sequence of the gene but essentially it's random. Harmful alleles tend to be recessive as if they were dominant, they would cause harmful effects even if present in only one copy.

[@xQryptic]

Ear wax; the best example for a gene.

[@user-or1tp5bo5q]

Sir can you define the term 'dominant allele' thankyouu

[@Name7.62]

A dominant allele will be expressed in the person's phenotype (characteristics) even if there's only one copy present.

[@AdamAdam-to7du]

Name 1 The phenotype is not just characteristics, it is the physical characteristics

[@amaankayani2437]

Thanks

[@tiarashari3729]

THANKS YOU

[@josephfoster2035]

why would he use earwax as an example instead of like eye colour

[@Freesciencelessons]

There are very few characteristics that are entirely down to simple allele combinations. Many characteristics that are used as examples are much more complex than they're shown to be. So I choose to use ear wax because it is one of the very few characteristics entirely down to a simple allele combination.

[@atif1650]

What is phenotype

[@FarmYardGaming]

The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment. Basically, the *visible outcome* of what the genotype is.

[@eimanbibi9433]

physical appearance of an organism

[@tronix4469]

How can you identify which allele is dominant?

[@abualasif]

capital letter is dominant (eg "E") lowercase is recessive (eg "e")

[@t.stizzy928]

Capital letter?

[@VictoriaAndHelen]

even though these definitions are simple, would I still get the marks if I wrote them in a higher tier biology test?

[@Freesciencelessons]

Yes, these are the correct definitions required by the exam board.

[@VictoriaAndHelen]

@@Freesciencelessons thank you so much!! :)

[@youareguacbbygurl1743]

last minute gang :)

[@priya200328]

So is genotype is the letters showing each alleles we get from out parents? And would I get a mark for this if I use it in my exam?

[@Freesciencelessons]

Yes that's essentially correct. I would say that the genotype is the combination of alleles responsible for a particular phenotype.

[@hiwothaile6041]

2021 anybody from class

[@LaLance44]

ty

[@nimrahk.3172]

i really didn't get the dominant and recessive part...

[@Name7.62]

So a dominant allele requires only one copy for it to be shown in the person's phenotype (characteristics) think of it as overriding the recessive allele. A recessive allele requires two copies of the recessive allele (no dominant present) for it to be shown in the person's phenotype.

[@eimanbibi9433]

Dominant-allele which controls characteristics wherever it is present. So, if you had one dominant and one recessive allele, the dominant one takes over, and that's what you can see (e.g eye colour) Recessive-allele whose characteristics only show up when it's present in both chromosomes, so if there's two recessive alleles they take over, but if theres on dominant and one recessive, dominant takes over

[@valeriovangraas1630]

The ear wax bit is weird for people wearing ear phones

[@aaaaaaaaabaaaaaaaaa]

Which exam board is this video series for?

[@chantelle5170]

aqa

[@zainabzacky1838]

Actually u can use it for all boards

[@alexminto5335]

That was a minging example

[@caitlingehensnama]

bio test in the morning

[@ob5878]

Gwarnnnn sunshine !!!

[@lillyhiggins1827]

Binge Watching The whole of the paper 2 videos at 11pm because she forgot to revise 💁🏻‍♀️👏🏻

[@shilpadesai8031]

1/ out 23 genes controls earwax.

[@harshiniirvin9143]

WOW!, I got all my key terms here!! Tysm sir!...and can there be more alleles? if there are, how come? as one allele comes from mom and the other from dad...

[@TeaTimePopin]

Yatta ,who reviving today for exam tomorrow

[@ayoo9963]

I'm dead wuts with tht tie 😂😂😭

[@Sillyme1285]

EXAMS IN TWO MONTHS ;(

[@Freesciencelessons]

Good luck. Keep watching the videos.

[@nigel__1239]

EXAM TOMOROW!!! ;(

[@holly6823]

wet ear wax.. yum yum

[@ahmedbenhariz8694]

scrumptious

[@revision886]

Apple Sauce you're making me hungry

[@annieli1244]

delectable

[@michaelthomas9802]

am i the only one who watches his videos on x2 the night before the exam?

[@clowna5912]

30 mins till exam 🤷🏾‍♂️

[@theonered1238]

Yeeeiiisssaiiiirrrrrr

[@esterawinkler1971]

i love you

[@Will-kn6lu]

my g

[@lordy4373]

What a lad

[@billygreenbank9678]

Is this paper 1

[@blue2003_1]

paper two

[@alexireade3408]

Billy Greenbank no

[@cmohandas]

+ rep

[@jelinsalin815]

2020?