3. Extensions to Mendelian Inheritance

When performing a complementation test, how do you know if two mutations complement?

How can you tell if two genes are epistatic?

Two heterozygous organisms are crossed, and the F₂ phenotypic ratio is 12:3:1. What form of epistasis do these two genes exhibit?

A cross of white plants and red plants was performed. Using the F2 phenotypic ratio data below, determine what form of gene interaction is taking place.