A particular cross gives a modified dihybrid ratio of 9:7.What phenotypic ratio would you expect in a testcross of the fully heterozygous F₁crossed with the fully recessive type? A)1:1 B)3:1 C)1:3 D)2:3 E)2:1

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Quizplus · Accepted Answer

The 9:7 ratio indicates a complementary gene interaction where two genes are involved. In a testcross with a fully recessive type, the expected phenotypic ratio is 1:3, as one phenotype requires both dominant alleles, and the other phenotype results from any other combination.

A Particular Cross Gives a Modified Dihybrid Ratio of 9:7