Breeders can use a Punnett square to predict the outcome of a genetic cross. If the genotype of both parents was Aa, what would be expected of the genotypes among their possible offspring?

Each Aa parent can pass on either A or a. Combining these possibilities gives offspring genotypes AA, Aa, Aa, and aa. Two of the four outcomes are Aa, so half would have the genotype Aa, making choice B correct.

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