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 _____.

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In incomplete dominance, neither allele is completely dominant over the other, so the heterozygous individual expresses a phenotype that is intermediate between the homozygous phenotypes. In this case, since the homozygous black allele is not completely dominant over the homozygous white allele, the heterozygous individuals would have gray feathers.

Feather Color in a Certain Species of Bird Is Controlled