(A) The production of four different types of gametes $(AB, Ab, aB, ab)$ indicates that the individual is heterozygous for both genes.According to the

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(A) The production of four different types of gametes $(AB, Ab, aB, ab)$ indicates that the individual is heterozygous for both genes.According to the law of independent assortment,an individual with the genotype $AaBb$ produces four types of gametes in equal proportions: $AB, Ab, aB,$ and $ab$.Therefore,the genotype of the individual must be $AaBb$.