In the F₂ of a dihybrid cross (AaBb × AaBb), what fraction of offspring is homozygous for both genes?
Correct answer B. 1/4
Explanation
P(homozygous for A gene) = 1/2 (AA or aa) and likewise 1/2 for B, so 1/2 × 1/2 = 1/4, that is 4 of the 16 combinations.
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