Question

The trait for dark-colored hair is dominant over the trait for light-colored hair in mice. Which statement correctly represents the phenotype and genotype for these traits?
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Genotypes dd and Dd result in light-colored hair phenotypes
Genotypes dd and DD result in dark-colored hair phenotypes
Genotypes Dd and DD result in dark-colored hair phenotypes
Genotypes DD and dd result in dark-colored hair phenotypes

Answer 1

Correct answer: Genotypes Dd and DD result in dark-colored hair phenotypes.

Explanation: The dark trait is dominant (allele D), so both homozygous dominant (DD) and heterozygous (Dd) show the dark phenotype. The light phenotype appears only in homozygous recessive (dd).