X-linked recessive: children of an affected father
A man with an X-linked recessive disorder has children with a woman who is not a carrier. What is expected?
Answer D: explanation for every choice
A
Sons inherit their father's Y, not his X.
B
Daughters must receive his affected X, so all are carriers.
C
Males have one X, so they are either affected or unaffected. They cannot be carriers.
D
Correct. Every daughter gets his X, carrying the allele. Every son gets his Y and his mother's normal X.
TakeawayFathers pass their X to every daughter and never to sons.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb55.