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) Codominance
B) It is a sex-limited trait
C) Simple Mendelian inheritance
D) Incomplete penetrance
E) Epistatic interaction of the two genes

Question

Quizplus · Accepted Answer

An epistatic interaction of the two genes could be causing the observed phenotypic ratio of 9:7 rather than the expected 9:3:3:1 ratio. This means that the genes are interacting with each other in a way that alters the expected outcome.

In a Dihybrid Cross of Two Heterozygous Individuals, You Expect