Question

Epistasis implies

• A. One pair of genes can completely mask the expression of another pair of genes.
• B. One pair of genes independently controls a particular phenotype.
• C. One pair of genes enhances the phenotype expression of another pair of genes.
• D. Many genes collectively control a particular phenotype.

Answer 1

The correct option is A One pair of genes can completely mask the expression of another pair of genes.

Epistasis is a phenomenon that consists of the effect of one gene being dependent on the presence of one or more modifier genes. A gene masks the effect of another gene. The interactions of the two genes which control comb type was revealed because we could identify and recognize the 9:3:3:1. Other genetic interactions were identified because the results of crossing the dihybrids produced a modified Mendelian ratio. All of the results are modifications of the 9:3:3:1 ratio.