In the marriage of dark-haired parents (dominant feature (A)), a blonde son was born. Determine the genotypes

In the marriage of dark-haired parents (dominant feature (A)), a blonde son was born. Determine the genotypes of family members for the indicated trait.

Because the son has blond hair – a recessive trait, which means the aa genotype, and the mother and father have dark hair – it means the parents are heterozygous (Aa) by the trait.

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