00:01
We're looking at a population in hardy -weinberg equilibrium.
00:04
Okay, when i see that, i want to write out two equations straight away.
00:09
They look a little bit like this.
00:15
Okay.
00:16
So this top one is for allule frequency.
00:18
If you have two allules for a gene, and you add up the frequency of each of them, you have to get 100%.
00:25
Because every copy of the gene is either the dominance of recessive allele.
00:29
Second is the genotype frequency.
00:31
Every individual has one of these three genes.
00:33
Genotypes.
00:35
Dominant homozygous, recessive homozygous, or heterozygous.
00:40
So if you add up bare frequencies, you also get 100%.
00:43
Okay.
00:45
The frequency of the dominant allele is 90%.
00:48
So capital a is 0 .9.
00:52
And from this, we can work out everything else based on these two equations and knowing it's in equilibrium...