00:01
We want to figure up the genotypes at 5 .0 .k.
00:03
Marked with the letters.
00:06
And the first thing we really need to do is figure out what kind of trait this is.
00:14
So is it dominant or recessive? and just from looking at the offspring of this pair here, if it were recessive, all of the children would have it, right? since both of them have the trait.
00:32
And since some of the children don't have it, we can be pretty certain it's dominant.
00:39
Okay, and then the other thing is, is it sex -linked or not? so if it were sex -linked on the y chromosome, then you know these, it's like this sun would have to have it here.
00:53
And since it doesn't, it's not y -linked.
00:56
So is it x -linked? that would mean that, you know, this male, marked with a b, is definitely carrying that x chromosome.
01:10
And the wife would be carrying two, would also be carrying an x chromosome.
01:19
Since they have a recessive child, however, that can't be the case, because the dad needs to be able to pass their x chromosome along and have it show up in this person after the c.
01:41
So it's going to be autosomal...