Population Genetics: When Darwin Met Mendel - Crash Course Biology #18

Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and Darwin, and by means of the Hardy-Weinberg equation.

Table of Contents:
1. Population Genetics 1:05
2. Population 1:14
3. Allele Frequency 1:41
4. 5 Factors 1:58
a) Natural Selection 2:12
b) Natural Selection/Random Mating 2:27
c) Mutation 3:18
d) Genetic Drift 3:49
e) Gene Flow 4:05
5. Hardy-Weinberg Principle 4:45
6. Hardy-Weinberg Equilibrium 5:15
7. Hardy-Weinberg Equation 6:18

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[TheFireflyGrave]

'Like Fast and Furious movies, there are five of them.'
Come on man, you had to know this reference would be outdated within a year.
'Do not mate randomly' on the other hand, is universal advice that transcends time and culture. 

[hannahcaplan]

my anthropology professor assigned us to watch this video for homework. and you explained it better than my professor whom i'm paying $20, 000 + tuition for. thanks, hank.

[MrJuandahero]

you and you're brother should consider making a crash course for math too, hopefully their's a third neglected brother with nothing going on.

[weaveroflaurel]

The best thing about these is your humor–it makes all the rest of it so much easier to relate to and understand. :)

[DavidFelipe]

I'm a biologist and I study population genetics. You explained the basis in an extremely simple and accurate way. Your video was a nice review of the general principles, thanks!

[MelanieDitmay]

I wish I could pay my university tuition to SciShow and Crash Course instead.

[richardxu]

It is amazing that you can write backwards.

[BarbarosaAlexander]

"And I have good news!  It's going to involve a lot of math..."

Just spat my soup across the screen.

[comfortablegrey]

I like how the video is flipped horizontally, so he didn't have to learn to write backwards or anything. Really clever!

[Iksnalow]

"Don't mate randomly" lol this made my day 

[Leonpavo]

I'm about to get my teaching certification after a year of being out of school. Your videos are a life saver. I never even learned this stuff in college.

[bt_papa]

Hey Hank, so I don't comment a lot, but I have a biology final tomorrow and I've had a pretty difficult time with biology. I was cramming tonight, and this video really helped me stop freaking out because you explained things so clearly. It takes a whole lot for that to happen. So I had to comment. You may never see this, but never stop what you're doing man, you're awesome. Thanks on behalf of all 121, 231 people that have watched this video.

[ebkdoa]

So is no one gonna talk about the fact that there's been a board in front of Hank all this time and we only notice when he starts writing?

[courtcourt]

slow down the playback to 0.5 if you wanna hear Hank teach drunk genetics

[vaciladoras]

Dude you are awesome!!! I absolutely loved it. Enjoyed it. Laughed with it. And refreshed, already known concepts, with it.
Wish more professors... actually high school teacher were more like you.
Keep up the good work.

[Bexahlia]

"Alas, earwax." - Harry Potter easter egg

[Jez]

Thank you very much for this video. I'm at university, 2nd year, studying a module called Evolution and Genetics and the Hardy Weinburg equation. The video helped me with my revision by giving me the background knowledge again and working through the equation. Really helped, thank you :D

[HendrikHenderson]

+Abhinav Das:
The video was edited to be flipped. For him, he wrote normally, but when flipped, it was left to right (normal) for us.

[imakevideossometimes]

Crash Course, the youtube channel that goes beyond time itself and is forever relevant

[mrsdiggory]

I'm a new teacher, struggling to explain all these equations without sounding like nonsense rambling in the class, finally know how to explain clearly now. thanks!!!!