00:01
Hi jean, so let's talk about hemophilia and answer your question.
00:05
So hemophilia is an x linked and recessive trait that's very important for this question and we'll come right back to that a woman is heterozygous for this trait also very important.
00:21
So those are our three pieces that we need to know so let's go ahead and make that woman here.
00:24
So we've got x links.
00:25
That means we're talking about her x x -chromosomes.
00:28
So here's the woman now.
00:30
She's a woman.
00:31
So if she's a typical woman, she would have two x's they don't say anything about you know, have an extra x or y so we're gonna assume two x's mmm, so it's x linked.
00:42
That means it's on the x chromosome.
00:44
It's linked x chromosome.
00:45
It's recessive so hemophilia, let's just say we will make it a little mmm a little h.
01:00
Okay, so it's recessive and it's she's heterozygous that means that she's got a little h for hemophilia little h for hemophilia and we'll say normal the dominant normal because she's heterozygous hetero means difference right hetero means that her chromosomes don't have the same trait on them or allele variation if it said homozygous then we would have a little h and a little h but it says heterozygous so we've got a normal and we've got the recessive hemophilia trait.
01:40
So this woman does not have hemophilia because she has a normal copy on one of her x's that is dominant and that's enough for her to be normal, but she carries this recessive trait so now let's move on which of the following statements is true of the woman and her daughters with regard to hemophilia so option one the woman has hemophilia...