In a dihybrid cross of two heterozygous individuals,you expect a 9:3:3:1 phenotypic ratio in the offspring,but observe a ratio of 9:7.What is the most likely explanation?
A) codominace
B) a sex-limited trait
C) simple Mendelian inheritance
D) incomplete penetrance
E) epistatic interactions of the two genes

Question

Quizplus · Accepted Answer

The observed phenotypic ratio of 9:7 indicates that there is an interaction between the two genes in the dihybrid cross. This type of ratio is commonly seen when there is epistasis between the two genes, where one gene masks or modifies the expression of the other gene. Therefore, the most likely explanation for the different ratio is epistatic interactions of the two genes.

In a Dihybrid Cross of Two Heterozygous Individuals,you Expect a 9:3:3:1