allele controls the expression? A dominant sex-linked gene in chickens produces barred feathers; the recessive allele controls the expression of nonbarred plumage. The creeper condition is the result of the interaction between 2 codominant autosomal alleles in the heterozygote. One of the alleles is lethal when homozygous, the other results in birds with normal legs. (a) If barred creeper females were mated to nonbarred creeper males, what phenotypes would be expected among the progeny, and in what proportions? (b) Assume that a normal nonbarred hen produced a brood consisting of 4 barred creeper males, 2 barred normal males, 2 barred creeper females, and 3 barred creeper males; describe the most likely genotype and phenotype of the sire.
A dominant sex-linked gene in chickens produces barred feathers; the recessive
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