00:01
We're looking at coat colour in dogs, and it has two alleles.
00:04
So we have capsule f for grey fur, and little f for black fur.
00:11
So grey is the dominant trait here.
00:14
And we're looking across between a heterozygous dog and a homozygous recessive.
00:21
So first thing we have to do is write out the genotypes of the parents.
00:25
So the female is heterozygous.
00:28
Eterozygous means she has one of each.
00:33
The male is homozygous recessive.
00:35
Homozygous means two of the same allele, recessive, so here's two of the recessive.
00:41
So that's the genotypes of the parents.
00:44
Now what happens when they have puppies? well, let's do a ponnet square.
00:49
So in a punnet square, you put the parental genotypes on the outside, like this.
00:56
So one along the top, one along the left...