Which Statement is INCORRECT Concerning an X-Linked Recessive Trait in Humans

Question

Which statement is INCORRECT concerning an X-linked recessive trait in humans?
A) An affected man often has phenotypically normal parents.
B) All the sons of an affected woman will be expected to be affected.
C) An affected woman almost always has an affected mother.
D) An affected man usually has a mother who carries the recessive allele.
E) A phenotypically normal woman whose father was affected is likely to be heterozygous for the condition.

Accepted Answer

An affected woman almost always has an affected mother is incorrect because an affected woman can have a carrier mother and an affected father, not necessarily an affected mother.