Marina always wanted to have normal vision, like her mother and both grandmothers (recessive symptom (a)).

Marina always wanted to have normal vision, like her mother and both grandmothers (recessive symptom (a)). But she has daddy’s myopia. Determine the genotypes of family members for the indicated trait.

Because Marina’s myopia is the dominant trait, which means the Aa genotype, and the father’s is myopia, and the mother and grandmothers have normal vision on both lines – aa) – this means the father is heterozygous (Aa) by the trait.
Answer: Mother – aa; father – Aa; daughter – Aa.

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