Rh-positive parents had a Rh-negative son (recessive trait (a)). Determine the genotypes of family members for the indicated trait.

Because in the son, Rh-negative is a recessive trait, which means the genotype is aa, and in the mother and father – Rh + – it means the parents are heterozygous (Aa) by the trait.
Answer: Mother – Aa; father – Aa; son – aa.

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