Assume That Developing a Sixth Toe Is a Recessive Trait

Multiple Choice

Assume that developing a sixth toe is a recessive trait that is controlled by a single pair of genes.If a child has six toes,but both the child's biological parents have normal feet,you can conclude that

A) one parent is heterozygous for the trait, and the other parent is homozygous.
B) both parents are heterozygous for the trait in question.
C) the child has been adopted.
D) both parents are homozygous for the trait in question.