Sex-Linked

How can you tell if a pedigree is X-Linked or autosomal? Will this kind of thing be on the test?

It’s possible it could be! The best way to tell if it is X-linked is to look at the ratio of males to females affected. Remember: if something is X-linked, it will result in many more males being affected since they only have one X chromosome, whereas females have two and would therefore have to have it on both. It is possible females could be carriers of this trait, which sometimes is notated on a pedigree, but not always. If they seem to be equally affected, it is more likely to me an autosomal trait.

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