00:01
Sickle cell anemia is an autosomal recessive disorder.
00:04
Doug has it, but his wife is homozygous dominant.
00:07
What's the chance they have a childhood condition? so the first thing i want to do is label, capsule a for the normal condition, so not having sickle cell anemia, little a for having sickle cell.
00:22
So these represent the two alleles you can have.
00:25
And then each person can either have two of the normal, one of each, or two of the b, and if you have at least one copy of the normal, you're healthy.
00:39
If you have two copies of the recessive, you get sickle cell anemia.
00:44
So we're going to be performing this genetic cross.
00:47
We need to know the genotypes of both parents.
00:51
We know that doug has sickle cell anemia.
00:53
So he must have two copies of the diseased allule.
00:57
His wife is homozygous dominant.
01:00
So homo means same.
01:03
Homozygous means two copies of the same allio.
01:06
Homosigous dominant means she has two copies of the normal alliole...