Which of the Following is NOT a Characteristic of X-Linked

Question

Which of the following is NOT a characteristic of X-linked recessive traits in humans?
A) More males than females are affected.
B) Approximately one-half of the sons of a female carrier are affected.
C) They cannot be passed from father to son.
D) Phenotypically normal daughters of affected men are always carriers.
E) Affected daughters always have an affected mother.

Accepted Answer

X-linked recessive traits can be passed from an affected father to a daughter if the mother is a carrier, so affected daughters do not always have an affected mother.