A female can inherit an X-linked recessive trait if her father:
A) is dominant and her mother is heterozygous for the trait.
B) is dominant and her mother is homozygous for the trait.
C) exhibits the trait and her mother is homozygous for the trait.
D) Both A and B are correct.

Question

Quizplus · Accepted Answer

This is because the X-linked recessive trait must have been inherited from the father (as the mother would have exhibited the trait had she been homozygous). Therefore, if the father exhibits the trait and the mother is homozygous for it, then any daughter will inherit the trait because she will receive the affected X chromosome from her father and her mother. Choice A and B are incorrect because an X-linked trait cannot be dominant, as it is only expressed when the individual has two copies of the recessive allele.

A Female Can Inherit an X-Linked Recessive Trait If Her