Okay, so this is a pedigree that's typical of the sort of pedigrees you're likely to get in the unit for biology exam. When a lot of people see a pedigree like this, they try to solve it all in one go. They try to just look at the pedigree and somehow see in it what the mode of inheritance is likely to be, whether it's X-linked dominant, X-linked recessive, autosomal dominant, or autosomal recessive. They try picking up patterns in there, but there's a better way of doing it. It takes us a little bit longer, but it guarantees that we'll get to the right answer. That's what I want to explain to you in this little screencast. The way we're going to do this is we're going to take each one of these modes of inheritance and use it as a sort of hypothesis. So let's take the first one, and we'll do them one by one. We're going to assume that this pedigree is showing a trait that's inherited as an X-linked dominant trait. That is, the locus of this gene is on the X chromosome. If that's the case, then a man who has this dominant trait must have the allele for the dominant trait on his only X chromosome. His other sex chromosome is a Y chromosome, of course. Now he marries a woman who, of course, has two X chromosomes because that's what makes her a woman. And because she doesn't have this dominant trait (we don't know if it's dominant yet, of course, but that's our hypothesis), then her genotype would have to be homozygous for the allele for the recessive trait. Now they have a daughter who, of course, has two X chromosomes. She'll inherit the big A from her dad and a little...
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7 generation pedigree chart Form: What You Should Know
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