Andrey always wanted to have a wide chin, like dad and mom. But he has a narrow chin, like both grandmothers

Andrey always wanted to have a wide chin, like dad and mom. But he has a narrow chin, like both grandmothers (recessive trait (a)). Determine the genotypes of family members for the indicated trait.

Because Andrei’s chin is narrow – a recessive trait, which means the genotype is aa, and for the mother and father it is wide – it means the parents are heterozygous (Aa) by the trait.
Answer: Mother – Aa; father – Aa; son – aa.

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