Feather Color in a Certain Species of Bird Is Controlled

Multiple Choice

Feather color in a certain species of bird is controlled by a pair of alleles that exhibit incomplete dominance. If birds that are homozygous for one allele are black and birds that are homozygous for the other allele are white, then heterozygous birds must be _____.

A) black
B) white
C) gray
D) black with white stripes