Ivan always wanted to have a square face, like his dad. But he has a round face, like his mother (recessive trait (a)). Determine the genotypes of family members for the indicated trait.
Because the son (Ivan) has a face and a round-shaped mother – a recessive trait – aa, and the father’s – a square one, which means the father is heterozygous (Aa) by trait.
Answer: Mother – aa; father – Aa; son – aa.
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