In corn a cross made between a homozygous red kernel and a homozygous white kern

Question

In corn a cross made between a homozygous red kernel and a homozygous white kernel strain. The F1 individuals all have white kernels only, and the F2 express both phenotypes in a distribution of 1285 white kernel: 3003 red kernel.
What ratio is best represented by the outcome in the F2? What type of epistatic interaction does this ratio represent?

Using the 3-step process, what is the likely genotype of the F1 parents?

How many genes are segregating? In other words, how many genes are directly responsible for the observed ratio?

Explanation / Answer

This ratio is best represented by 13:3 epistatic ratio. 13:3 ratio is actually due to the presence of suppressor genes. In this epistatic interaction, the genes do not directly cause the expression of the characters, but suppress the characters of other genes.

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