If a man expresses an X-linked recessive trait,____.

Question

Quizplus · Accepted Answer

Since X-linked recessive traits are carried on the X chromosome, if a man expresses the trait, he must have inherited the mutated allele from his mother. Therefore, his mother must either be a carrier of the trait (heterozygous) or express the trait (homozygous). His father may or may not carry the trait, and his siblings may or may not express the trait depending on their own genetic makeup.

If a Man Expresses an X-Linked Recessive Trait,____