Sex chromosomes in birds are referred to as “W” and “Z”, with females being the heterogametic sex and males being homogametic for the Z chromosome. In chickens, the allele for feather color is Z-linked with black feathers dominant to red feathers. If a rooster that is heterozygous for black feathers mates with a red hen, what is the probability that their chicks will be red hens?
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