Sex linked and pedigree

Some genes are sex linked, which means that they occur on an X chromosome such that only when there is no other x chromosome, the trait will show. Which means males are more likely to show the trait than females.
when doing problems on sex linked genetics, always label whether the genes are on an X chromosome, and whether the individual has a y chromosome.

this is useful in pedigrees because we can easily see all the genders and genetic identities of individuals. We can then find whether the trait is dominant, recessive, sex linked, or not.