English: This pedigree has a sex-linked dominant disorder. It is possible to tell it is dominant because it doesn't skip generations. It is possible to tell it is sex-linked because affected fathers will pass the trait on to all of their daughters. This is because they have to pass along their affected dominant x but none of their sons because they pass on a y to their sons. The affected mother in the second generation is heterozygous (having a dominant and a recessive allele) will have a 50% chance of passing the trait on to all of her children regardless of their gender.
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