Rooster feathering in chickens is inherited with the autosomal recessive allele r. Hen feathering is inherited with the autosomal dominant allele R. The trait is sex-limited, only males will show rooster feathering. A rooster-feathered male is mated to a hen-feathered female. All of the male offspring have rooster-feathering. What is the genotype of the hen-feathered mother?Multiple choice question.RRRrrr
Question
Rooster feathering in chickens is inherited with the autosomal recessive allele r. Hen feathering is inherited with the autosomal dominant allele R. The trait is sex-limited, only males will show rooster feathering. A rooster-feathered male is mated to a hen-feathered female. All of the male offspring have rooster-feathering. What is the genotype of the hen-feathered mother?Multiple choice question.RRRrrr
Solution
The genotype of the hen-feathered mother is Rr.
Here's why:
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The rooster-feathered male has the genotype rr because rooster feathering is a recessive trait, and he must have two copies of the recessive allele to express this trait.
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The hen-feathered female must have at least one dominant allele R to express the hen feathering trait.
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However, all of the male offspring have rooster-feathering, which means they must have received the recessive allele r from their mother.
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Therefore, the hen-feathered mother must be heterozygous Rr, having one dominant allele (R) and one recessive allele (r).
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