00:01
For a certain population, we have one gene that we are looking at and it is b.
00:05
And thus we have three different genotypes that we can look at.
00:08
Homozygous dominant, heterozygous, homozygous recessive, respectively in that order.
00:12
So we're going to be looking at this population across two different generations.
00:16
So generation one, 250 of both homozygous genotypes, 500 of heterozygous, meaning this population is in equilibrium.
00:27
But then in generation two, we see that there's a big change.
00:33
There's a lot less individuals or year two, whatever it is.
00:36
So now there's only 75 homozygous dominant, 225 heterozygous, and 200 homozygous recessive.
00:44
So based on this information, we're going to figure out two things.
00:47
First of all, we're going to figure out survival rates.
00:53
And so we're going to do this for each of the different genotypes.
00:56
Now, this is a very simple mathematical question.
01:00
For survival rates for being homozygous dominant, so this first genotype, we're just going to take how many survived to that second rotation, that second year, and divide it by how many were originally there.
01:14
So for this first genotype, that's 75 out of 250 that survived.
01:19
So 75 divided by 250 comes out as 0 .3 or 30 % survived.
01:28
Right? we just do that same thing for all the genotypes.
01:32
Next one, 225 out of 500 survived.
01:36
So 225 divided by 500 comes out as 0 .45 or 45%.
01:43
And lastly, 200 out of 250 survived, which comes out as 80%...