Under what conditions does one expect a 9:3:3:1 ratio?
A)monohybrid cross F2 with independently assorting,completely dominant genes
B)dihybrid test cross F2 with independently assorting,completely dominant genes
C)dihybrid cross F2 with independently assorting,completely dominant genes
D)dihybrid cross F1 with independently assorting,completely dominant genes
E)monohybrid test cross F2 with independently assorting,completely dominant genes

Question

Quizplus · Accepted Answer

A 9:3:3:1 ratio is expected in a dihybrid cross F2 with independently assorting, completely dominant genes. This ratio results from the combination of two independently assorting traits, each with two possible dominant alleles, resulting in 9 different genotypes with the dominant phenotype for both traits, 3 different genotypes with the dominant phenotype for one trait and the recessive phenotype for the other trait, 3 different genotypes with the recessive phenotype for one trait and the dominant phenotype for the other trait, and 1 different genotype with the recessive phenotype for both traits.

Under What Conditions Does One Expect a 9:3:3:1 Ratio