You explained it exactly as my teacher, thanks for the review!

this guy has been helpful through 3 semesters of bio its amazing how he makes it all click

bloody amazing, people have been trying to teach me that for a whole year now, and now in just 15 mins it makes perfect sense. HOW ARE YOU SO GOOD!! thanks very much :)

Thank you, thank you so much. I can't even begin to tell you how useful this was.

I really love the way of teaching here!!

hey guys ohmymymymy i looooove this topic!! but honestly his handwriting is sooooo goals.... like i love it sm.....ohmygod i can't even

Keep P dominant and q recessive. There are other stat. formulas in population genetics that will call for one or the other; and most textbooks list the the formula as P^2 + 2pq+ q^2=1. Hope this helps, cheers.

What even is Hardy Weinberg equilibrium and why do we make all these assumptions about a given population? If it's based on so many assumed things, how can the numbers be accurate? Or is it not supposed to be accurate?

@luciekimber7255

6 жыл бұрын

Yeah! I have same questions too...

Well made and easy to follow. Covers just about everything you need to know for exams

This was an extremely useful revision tool! Thank you very much for posting it ^-^

I wasted a day trying to get this! Thanks so much for helping me get it so i can enjoy the remaining portion of the weekend!

You guys literally have every subject its great

Taught me WAY more than my biology teacher ,, Thanks a million!

Thank you! I'm a 2nd year med student, you are articulate and succinct. Job well done!

@ChiragSonne

Жыл бұрын

me too

Better than my medical school's biochemistry teacher! Great work Khan Academy!

Omg i have been depressed and kind of crying for last 2 hours because i have my medical entrance test after 7 days and i couldnt understand this, you made it so easy Thanks Khan academy

@Imran-cf9cs

Жыл бұрын

Mdcat?

I pay 23k a year for an education and I find myself learning more from KZread than my professors. FML. Thanks Khanacademy.

@SoorajSuseelan10001

Ай бұрын

This is your 12 year old self commenting. I wonder how you will be feeling when I invoke your attention now 😊

Thanks a lot! I was quite confused about this principle, but now I get it.

Thank you, Mr. Anderson. Excellent.... video. I am excited and not understand this process for class. Way to go! (:

isn't P the freq. of the homozygous dominant allele but why did he calculate the freq. of BB using q instead of p?

Thank you very much! Great work!

Wow just made so much more sense than my class! Thanks!

Words can't express how grateful I am.

wow that was brilliant, finally some genetics i actually understand!!!! thankyouuuuu :):):)

You are amazing...better than soooooooooo many teachers at explaining things...the education system should be full of teachers who can actually explain things to idiots like me!

Very well explained. helped me a lot thank you

khan academy is a grade saver, thank you

Thank you! Greatly appreciated!

It doesn't matter what the notation is, as long as you don't switch it in the middle of the problem. It's really not confusing at all, he explains it very well.

Thank you, Khan!

Thank you so much for this! This is so usefull!

I can't believe how easy that was. Also can't believe how our teacher could make it seem so incredibly difficult that we all struggle with this O.o am sending this link to everybody in my class xP

Guys, unless your teacher explicitly states it, which one you designate as p or q hardly really matters. Once you go into the harder problems you lose total dominance and you'll start working with more than one allele per situation. Conceptually p and q are just variables,they can be whatever you want them to be.

This is great! Thanks so much!

your lecture is very good ,thank you.

THANK YOU FOR POSTING! i gotta bio test coming up thats gonna be a bitch and my books making no sense at this point. once again, thank you

I don't understand the logic behind this, but you have a very nice voice and it makes it easier to follow your train of thought...

I wanted to know how those 5 factors affect this principle and off course those graphs- directional etc.

Loved the video-

love you're handwriting :D

My biology books makes it out to be so much more confusing then it needs to be, but this video explains it very clearly.

you sir are a hero

hahaha, u need to be my AP bio teacher, this was sooooo helpful

Fantastically usefull!

Very helpful thanks!

This is so helpful!

Goodjob, thanks for the help

this is very helpful thanks

p is the frequency of the dominant allele in a population, just saying.. bb (blue eyes) is a recessive trait..

@bobross3356

7 жыл бұрын

it doesn't matter if you represent it

@lola-sk1dd

4 жыл бұрын

@@bobross3356 oh but it does matter if ur teaching ppl that are already a bit confused u had me wondering wat i was doing wrong for a sec

This should really help. Thanks!

helpful ty this will help me for my test tommorw ty boss

thank you so much!!! this was so helpful!!!!! :D

you legit saved my life

Keep up the good work.

Thank you so much

Brilliant!

amazing!

this is really helpful!!!!!

THANK YOU SO MUCH

Awesome mate

Amazing!

Khan, I want to make a request: Apparently this is more statistics related to this topic(chi-square distributions), so can you make video(s) on the statistics part? Thanks

Awesome !!!!

this is so helpful, but how would you predict the genotype frequencies and the allele frequencies for the next generation?

its good that you explained pretty clear. but the book and test are mostly indicated "p" is dominate gene allele and "q" is recessive allele. so i dont wanna comfuse myself so i dont wanna continue watching it. thx though

I don't think it matters what P and Q are, recessive or dominant etc. It all adds the same, aslong as you state what you've used P and Q for, then it shouldn't matter.

@Wil_87

8 жыл бұрын

+triggertheoriegroupy the maths will tally, but convention says that p = Dominant and q = ressessive

@kkon8966

6 жыл бұрын

It matters when a student learns something incorrectly

THANKS!!! Well, if only my whole A-level was this easy :p

Thank you!

Very Important! The dominant allele frequency is represented by p and the recessive allele frequency is represented by q.

So in hardy-weinberg problems, do we assume that there is either no variation or that the variation is negligible? Is that a correct understanding?

so all of this is assuming that the population IS in an Hardy Weinberg equilibrium, right?

God Bless you Sir! :))

Switched P and Q

@noahfraser395

8 жыл бұрын

+Audrey Mae Moncada Hey

wow, a week in Bio 30 class didn't teach me anything, but 15 minutes at my computer taught me the whole damn thing!!!

nicely explained

This guy is a genius.

this video was so helpful oh my god

OH MY GOD THANK YOU!!!

thanks good job !!!

the one thing i dont understand is why there arent more teachers like you out there

very helpful!

Thanks!

this video was really helpful, but it does assume some prior knowledge of certain terms (homozygous, heterozygous, hybrid, allele, phenotype, genotype ect.) so while very helpful for myself and others who have some of this prior knowledge - might be a bit confusing for people just starting off in the subject. it might be a good idea for said people to look up some of these terms, and put a little research into allele/phenotype frequencies - and hopefully this video will be much more helpful :)

Preciate it bud, would be awsome if you would have gone into detail about the mathematics of 2pq like you did p and q squared though. i was able to figure it out myself though.

why are we multiplying the probabilities rather than adding them?

Can you explain this one to me 100 people are typed at a biallelic ( 2 alleles) locus with allelic frequencies of p=0.6 and q=0.4. Assuming Hardy weinberg equilibrium, how many are hetrozygous (explain working out please)

very well explained.great teacher..which software is used here?

I love your handwriting. You're very good at explaining though I still do not understand it. I'll watch it later again, it's too late too be focussed.

THANK YOU :)

Lol. I like how he comes back to finish the word "Equilibrium."

Thx a lot

Yes but you can personally assign a meaning to a pronumeral. E.g. Where a= dominant allele and A=recessive.

how do you do when you have a gen with 4 alelles?

Could you tell me the specific Wacom Bamboo Tablet model you're using to make this great videos? Thanks

Fine Arts majors should e warned before enrolling in a class that involves math. Even a little bit. This was a huge help. Seriously, you have no idea.

Can anyone please explain the math in this video? I can't understand these conversions from squared 0,09 to 0,3 than to 30%, as it is at 9:40

@itsthefantasy the results will be the same, but sometime in your studies a question stem may specify 'homozygous dominant' and ask for you to match the variable. This is what happened to me as I was studying for the MCAT... otherwise, especially on the basic level of studying, I guess it doesn't make a difference.

If the population is now in Hardy-Weinberg equilibrium it should be relatively constant and so it shouldn't change from one generation to the next. If the phenotype for green skin is 12% and this is stable q2= 0.12. The square root of q2 to the nearest hundredth is 0.35, so q, the frequency of the green skin allele will be 0.35. Hope this helps.

I have a question, my teacher uses "q" for recessive and "p" for dominant alleles, is that the same thing??

Which software did u used??? Its really amazing. . .