00:02
Hi there.
00:03
In this question, we have two parents that are both carriers for this disease that is carried as an autosomal recessive disease.
00:13
So i'm just going to use the alleles capital a and little a.
00:18
Little a, of course, is the recessive allele that codes for the disease.
00:26
Capital a is normal.
00:28
So when these two parents produce gametes, half of them are going to be capital a, half of them will be.
00:33
Be little a.
00:35
When they combine to form a zygote, there's going to be a one -fourth chance that we get capital a, capital a, a one -half chance that we get capital a little a, and a one -fourth chance that we get little -a, little -a.
00:53
If you need to sketch out your punnet square, you could do that really quickly here.
01:00
So one parent is capital a little a, the other parent capital a little a.
01:03
One of our four boxes is capital a little a, two of our four boxes, or one half, or capital a little a, and then we have little a little a...