You explained it exactly as my teacher, thanks for the review!
@gothcoffeedrinker420
12 жыл бұрын
this guy has been helpful through 3 semesters of bio its amazing how he makes it all click
@richisnang1
12 жыл бұрын
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 :)
@xxprincesszeexx
12 жыл бұрын
Thank you, thank you so much. I can't even begin to tell you how useful this was.
@AmanKumar-yu5jb
5 жыл бұрын
I really love the way of teaching here!!
@iota1122
14 жыл бұрын
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.
@simonadeutsch5680
5 жыл бұрын
hey guys ohmymymymy i looooove this topic!! but honestly his handwriting is sooooo goals.... like i love it sm.....ohmygod i can't even
@721bmx
11 жыл бұрын
You guys literally have every subject its great
@Aelfraed26
13 жыл бұрын
Words can't express how grateful I am.
@AllahCreatedMe
13 жыл бұрын
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!
@FatalMindedMe
13 жыл бұрын
This was an extremely useful revision tool! Thank you very much for posting it ^-^
@KeenCode
11 жыл бұрын
Well made and easy to follow. Covers just about everything you need to know for exams
@AintNobodyAskYou
11 жыл бұрын
Taught me WAY more than my biology teacher ,, Thanks a million!
@michaelbradshaw9381
11 жыл бұрын
Thank you! I'm a 2nd year med student, you are articulate and succinct. Job well done!
@ChiragSonne
Жыл бұрын
me too
@Julie-fh5gi
9 ай бұрын
khan academy is a grade saver, thank you
@bigsword33
10 жыл бұрын
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.
@ATMfromNJ
11 жыл бұрын
Better than my medical school's biochemistry teacher! Great work Khan Academy!
@boxermitro
10 жыл бұрын
Thank you very much! Great work!
@DarkMysteryCat
14 жыл бұрын
Thanks a lot! I was quite confused about this principle, but now I get it.
@josieladle5092
11 жыл бұрын
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.
@evo3711
6 жыл бұрын
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...
@ogtej
12 жыл бұрын
Wow just made so much more sense than my class! Thanks!
@MNflysociety
12 жыл бұрын
I pay 23k a year for an education and I find myself learning more from KZitem than my professors. FML. Thanks Khanacademy.
@SoorajSuseelan10001
2 күн бұрын
This is your 12 year old self commenting. I wonder how you will be feeling when I invoke your attention now 😊
@loz764
13 жыл бұрын
wow that was brilliant, finally some genetics i actually understand!!!! thankyouuuuu :):):)
@Sir1Snorteaus
10 жыл бұрын
Thank you, Khan!
@minahilkhattak4047
2 жыл бұрын
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?
@lwarfield52
7 жыл бұрын
Thank you, Mr. Anderson. Excellent.... video. I am excited and not understand this process for class. Way to go! (:
@sadeedmusabbir7856
9 ай бұрын
Very well explained. helped me a lot thank you
@Sn0wFreak
13 жыл бұрын
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!
@ahmedst
14 жыл бұрын
Thank you! Greatly appreciated!
@FaerieDust
13 жыл бұрын
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
@jenniferchu3443
10 жыл бұрын
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
@passionatesilence
12 жыл бұрын
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...
@djennym3960
9 жыл бұрын
isn't P the freq. of the homozygous dominant allele but why did he calculate the freq. of BB using q instead of p?
@madhavimothkuri
13 жыл бұрын
your lecture is very good ,thank you.
@jasenkim22
14 жыл бұрын
you sir are a hero
@healthfreak18
12 жыл бұрын
This is great! Thanks so much!
@veronicaarnold832
11 жыл бұрын
My biology books makes it out to be so much more confusing then it needs to be, but this video explains it very clearly.
@Smilllerr
13 жыл бұрын
Thank you so much for this! This is so usefull!
@Brinn18844
12 жыл бұрын
love you're handwriting :D
@bhanumahajan8344
2 жыл бұрын
Loved the video-
@sn321097
13 жыл бұрын
hahaha, u need to be my AP bio teacher, this was sooooo helpful
@jeffreysuzuki3065
11 жыл бұрын
Keep up the good work.
@tracks_
14 жыл бұрын
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
@audreymaemoncada3970
8 жыл бұрын
Switched P and Q
@noahfraser395
8 жыл бұрын
+Audrey Mae Moncada Hey
@blackandwhitepiano1
12 жыл бұрын
Fantastically usefull!
@TheMahirahmed07
10 жыл бұрын
Very Important! The dominant allele frequency is represented by p and the recessive allele frequency is represented by q.
@siobhaneaston9779
10 жыл бұрын
Very helpful thanks!
@Juigi33
12 жыл бұрын
Goodjob, thanks for the help
@aneatrice28
10 жыл бұрын
This guy is a genius.
@cursedu
14 жыл бұрын
helpful ty this will help me for my test tommorw ty boss
@Jchachas
13 жыл бұрын
you legit saved my life
@virupannamedikinal
Жыл бұрын
Thank you so much
@ben-l-6234
11 жыл бұрын
This should really help. Thanks!
@Punjabibahman
11 жыл бұрын
Awesome mate
@nishabilkhiwal997
6 жыл бұрын
I wanted to know how those 5 factors affect this principle and off course those graphs- directional etc.
@mslizziey8
11 жыл бұрын
This is so helpful!
@Peterross111
14 жыл бұрын
THANKS!!! Well, if only my whole A-level was this easy :p
@BethTheKilljoy
11 жыл бұрын
Brilliant!
@12chultm
11 жыл бұрын
thank you so much!!! this was so helpful!!!!! :D
@Olympics1001
12 жыл бұрын
this is very helpful thanks
@dfsfklsj
12 жыл бұрын
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
@triggertheoriegroupy
10 жыл бұрын
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
@deffy4
8 ай бұрын
amazing!
@sadafshaikh8079
6 жыл бұрын
Amazing!
@fingertaping
12 жыл бұрын
wow, a week in Bio 30 class didn't teach me anything, but 15 minutes at my computer taught me the whole damn thing!!!
@anweshpanda7417
2 жыл бұрын
nicely explained
@xoxdanielleeexox
11 жыл бұрын
THANK YOU SO MUCH
@piprod01
12 жыл бұрын
Don't worry, P and Q are just standins for the frequencies of the two different alleles, if it helps pause the video and follow through it all on paper but every time he uses P or Q substitute them for what they stand in for.
@jazgriffin15
12 жыл бұрын
this is so helpful, but how would you predict the genotype frequencies and the allele frequencies for the next generation?
@Tictactoe247
11 жыл бұрын
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.
@alfares94
11 жыл бұрын
Awesome !!!!
@SailaMaham
11 жыл бұрын
Thank you!
@CasperWK
13 жыл бұрын
the one thing i dont understand is why there arent more teachers like you out there
@nowheretogobutup
13 жыл бұрын
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.
@samheckle
11 жыл бұрын
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.
@lilyjune1230
13 жыл бұрын
this is really helpful!!!!!
@ea03941d
11 жыл бұрын
I finally get it, thx mate
@soliellieben
13 жыл бұрын
very well explained.great teacher..which software is used here?
@Alinask84ever16
8 жыл бұрын
Could you please tell me what software u use ? I love it.
@OriginalShuffler
8 жыл бұрын
Looks like it's simply Microsoft Paint.
@josefgiven
14 жыл бұрын
@SeoulSarah Dunno if this is going to be too late, but if I've understood Sal's vid correctly, the 60% in your example is the allele frequency. It makes sense that the frequency of alleles in the gene pool would be higher than that of homologous pairs of chromosomes with the same allele, which are at 36%. Hey, I think I'm learning something from these vids!
@robertschmink4289
10 жыл бұрын
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?
@Monokuro92
12 жыл бұрын
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 :)
@tbplc
11 жыл бұрын
this video was so helpful oh my god
@aleemshaan
13 жыл бұрын
Which software did u used??? Its really amazing. . .
@ROTTiiSHA
13 жыл бұрын
God Bless you Sir! :))
@mikelmanson
11 жыл бұрын
Could you tell me the specific Wacom Bamboo Tablet model you're using to make this great videos? Thanks
@Kago6267
10 жыл бұрын
Yes but you can personally assign a meaning to a pronumeral. E.g. Where a= dominant allele and A=recessive.
@menaleaus
13 жыл бұрын
@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.
@TheRealShaiLamar
7 жыл бұрын
Thanks!
@KeenCode
11 жыл бұрын
It doesn't matter unless you prefer having dominant first; then it's simply aesthetics
@Gillster9180
11 жыл бұрын
thanks good job !!!
@lukascocco
11 жыл бұрын
yea it should because P is for the dominant allele and q is for the recessive one!
@RiekeDobo
13 жыл бұрын
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.
@cleverererererererer
9 жыл бұрын
You're a godsend 🙌
@bamfan1994
11 жыл бұрын
Of the four alleles there, (Bb and bb) 75% are the 'b' allele (3/4 of the alleles are 'b') and 25% (1 out of 4) of the alleles are 'B'.
@boeing747200lr
14 жыл бұрын
mindblowing
@michaelandersen5071
11 жыл бұрын
Watch it again and listen closely. It's very simple and not random at all. He simply counts how many of the GENOTYPE ellels are 'b' for blue eyes. Three out of four is 75%. Simple :)
@CATHY0131
10 жыл бұрын
these videos are very helpful however, people, please note that homozygous dominant is represented a p and the homozygous recessive is q in the hardy weinberg equilibrium!. dont get it wrong on your exam
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