If a Man Expresses an X-Linked Recessive Trait, We Can

Multiple Choice

If a man expresses an X-linked recessive trait, we can draw the following conclusion:

A) His father carried the mutation.
B) His father transmitted the trait to his son.
C) His mother did not carry the mutation gene.
D) His mother was heterozygous or homozygous for the trait.
E) All his brothers will also show the trait.