Parents with polydactyly (six-fingered) (dominant feature (A)) had a daughter without the indicated anomaly. Determine the genotypes of family members for the indicated trait.
Because the daughter has five fingers – a recessive trait, which means the aa genotype, and the mother and father have six fingers – it means the parents are heterozygous (Aa) by the trait.
Answer: Mother – Aa; father – Aa; daughter – aa.
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