Question

Rooster feathering in chickens is inherited with the autosomal recessive allele r. Hen feathering is inherited with the autosomal dominanat allele R. The trait is sex-limited, only males will show rooster feathering. A male chicken with the genotype Rr will show _________.

1) rooster feathering
2) hen feathering
3) both rooster and hen feathering
4) neither rooster nor hen feathering

Answer 1

A male chicken with the genotype Rr will exhibit hen feathering because the hen feathering trait is dominant, and only one dominant allele is required for its expression.

Step-by-step explanation:

Rooster feathering in chickens is an example of a sex-limited trait with a simple Mendelian inheritance pattern. The dominant allele (R) is associated with hen feathering, while the recessive allele (r) is linked to rooster feathering. A male chicken with the genotype Rr will show hen feathering

This is because hen feathering is dominant, and only one dominant allele is necessary to express the trait. As the male chicken has at least one R allele, hen feathering will be the phenotype expressed, even though the trait is only expressed in males.