In some plants a red pigment, cyanidin, is synthesized from a colorless precurso

Question

In some plants a red pigment, cyanidin, is synthesized from a colorless precursor. The addition of a hydroxyl group(OH-) to the cyanidin molecule causes it to become purple. In a cross between 2 randomly selected purple plants the following offspring resulted:

94 purple
31 red
43 colorless

How many genes are involved? Which genotypes produce purple, red, and colorless?

(I asked someone about this and they said that purple is dominant. They also said that there are two main characters derived from one character, and based on that I would think that the effect could be achieved with two genes, but I am not sure, but it so would the epistasis effect be observed here?) Even if you can't answer to the epistasis effect I really need help finding the genotypes. Thanks!

Explanation / Answer

Genotypes of following are- Purple - AaBb red - Aabb colorless - aabb Two genes are involved.

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