In the testcross Aa Bb × aa bb, what proportion of individuals are expected to be homozygous for both genes in the F₁ generation? A)1/4 B)1/2 C)3/4 D)All are homozygotes. E)None are homozygotes.

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In a testcross Aa Bb × aa bb, the offspring can be Aa Bb, Aa bb, aa Bb, or aa bb. Only the genotype aa bb is homozygous for both genes, which occurs with a probability of 1/4.

In the Testcross Aa Bb × Aa Bb, What Proportion