In Mice,short Hair Is Dominant to Long Hair

Multiple Choice

In mice,short hair is dominant to long hair.If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result,one can conclude that

A) the short-haired parent is homozygous.
B) the short-haired parent is heterozygous.
C) the long-haired parent is heterozygous.
D) both parents are homozygous.
E) This cannot be answered without more information.