For each missing word or phrase, circle the choice that correctly completes the sentence. In chickens, the allele for black feathers is co-dominant with the allele for white feathers. Black-feathered and white-feathered birds are ____ for either the black (B) allele or the white (W) allele. The genotype of an offspring of a black rooster and a white hen is ____ and has a ____ of (BW). The ____ of the offspring shows ____
a. heterozygotes; heterozygous; phenotype; genotype; some white and some black feathers
b. homozygotes; homozygous; genotype; phenotype; all white feathers
c. heterozygotes; homozygous; phenotype; genotype; all gray feathers
d. homozygotes; heterozygous; genotype; phenotype; all black feathers
