00:01
So we know the parent's genotypes here, and we are trying to figure out specific probabilities of offspring genotypes.
00:06
You could set up a trihybrid cross, but this one is easier to do the probability ratios here.
00:14
So what we're going to do is take each trait individually, starting with a, and take both of those.
00:19
So parent one is heterozygous, parent two is homozygous dominant, and essentially fill in these monohygid crosses for these different traits here.
00:28
So both parents are heterozygous for b, and then both parents are heterozygous for c.
00:34
And then we're going to multiply the probability of finding each of these genotypes per each trait.
00:42
So for our a trait here, there is a 50 % chance, a 2 out of 4, that the offspring will have 2 capital a's.
00:52
There is a 1 out of 4 chance.
00:54
The offspring will have 2 capital b's, and a 1 .1 .4 chance.
00:55
The offspring will have 2 capital bs, and a 1.
00:58
Out of four chance that the offspring will have two capital c's.
01:01
So when we multiply that all together, there is a one out of 32 chance that the offspring will be homozygous dominant for all three traits.
01:08
Moving on to the next one, heterozygous for a, there is a 50 % chance.
01:13
Heterosigus for b, there is also a 50 % chance...