00:01
So in this question, we're given snakes.
00:03
We're given a big s equals rough.
00:08
Oh, no, wait, smooth.
00:10
I start that smooth.
00:13
And a little s equals rough.
00:17
And then we're given a big b equals brown and a little b equals green.
00:26
Awesome.
00:26
And then we're told that a female snake heterozygous at both loci.
00:30
Big s, little s, big b, little b, crosses with a snake that is homozygous recessive at both loci.
00:37
So little s, little s, little s, little s, little b, little b.
00:42
There we go.
00:43
And i'm just going to do a branch diagram here.
00:49
So when we cross these two, we're going to get half of them.
00:53
We're going to be big s, little s, and half of them, little s, little s.
00:57
Then when we go and cross here, you're going to get half, big b, little b, and half, little b.
01:10
And then you just repeat it over here.
01:19
Now when we go to do the end, we say, okay, 1 half times 1 half are going to be one -fourth, big s, little -s, big b, little b.
01:33
Now 1 -half times 1 -half, so 1 -4th are going to be big -s, little -s, little -b, little b.
01:40
I can do a better little -a.
01:45
Over here, same thing, 1 -4th, are going to be little -s, little -s, big -b, little -b, and 1 -4th are going to be little -s, little -s, little -s, little -b, little -b...