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Ratio of complementary genes

1. 9 : 3 : 4
2. 12 : 3 : 1
3. 9 : 3 : 3 : 4
4. 9 : 7

Correct answer: 9 : 7

Solution

Complementary genes interact so that a dominant allele at both loci is required for the trait to be expressed. In an F2 dihybrid cross, only 9 of 16 offspring have at least one dominant allele at each gene, giving a 9:7 ratio.

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