Independent assortment predicts a 9:3:3:1 ratio with four different phenotypes in the F2 progeny. If the alleles are epistatic, what would you predict?
A) heterozygotes with a novel phenotype between the dominant and recessive homozygotes
B) 1/3 of the progeny with the dominant phenotypes and 2/3 recessive
C) more than four phenotypes
D) fewer than four phenotypes
E) no change in the 9:3:3:1 ratio

Question

Quizplus · Accepted Answer

Epistasis can alter the phenotypic ratios expected from independent assortment by suppressing the effect of alleles at one gene due to the presence of certain alleles at another gene, often resulting in fewer distinguishable phenotypes.

Independent Assortment Predicts a 9:3:3:1 Ratio with Four Different Phenotypes