If a Daughter Expresses an X-Linked Recessive Trait,she Inherited the Trait

Question

If a daughter expresses an X-linked recessive trait,she inherited the trait from ____.  
A) her mother
B) her father
C) both parents
D) neither parent
E) her grandmother

Accepted Answer

A daughter expressing an X-linked recessive trait must have inherited one copy of the recessive allele from each parent, as females have two X chromosomes, one from each parent.