In a dihybrid cross between two plants heterozygous for both genes (AaBb × AaBb), the expected phenotypic ratio is ____.
Correct answer B. 9 : 3 : 3 : 1
Explanation
Each gene gives 3 : 1 independently, and (3 : 1) × (3 : 1) = 9 : 3 : 3 : 1 when the genes assort independently.
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