A man with an X-linked recessive trait has a daughter with a woman who does not exhibit the trait. What is/are the possible genotype(s) of the daughter?

Question

Quizplus · Accepted Answer

The daughter will have at least one recessive allele for the trait, inherited from her father. All we know about the mother is that she is phenotypically normal, so her genotype could be either X^BX^B or X^BX^b. Thus, the daughter could inherit either allele (dominant or recessive) from the mother, so she could be a heterozygote for the trait, or could actually have the trait.

A Man with an X-Linked Recessive Trait Has a Daughter