A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic chara

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A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

Accepted Answer

Sol.(d) [Key Concept: Gamete Types — Determining Genotype] If a person produces 4 types of gametes (AB, Ab, aB, ab) in equal proportions (1/4 each), both genes must be heterozygous. The genotype AaBb produces gametes: AB (1/4), Ab (1/4), aB (1/4), ab (1/4) — exactly what is described. AaBB would produce only AB and aB; AABb would produce only AB and Ab; AABB would produce only AB. Therefore, genotype is AaBb.

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