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In both cattle and horses, reddish coat color is not completely dominant to white coat color. Heterozygous individuals have a mixture of reddish hairs and white hairs, which is called roan. Because the reddish and white colors are expressed independently in the roan heterozygote, we sometimes reger to this as a case of codominance. Codominance refers to instances in which the heterozygote simultaneously expresses the phenotypes of both types of homozygotes. Just like in incomplete dominance these findings did not prove Mendel wrong.
