You are breeding different varieties of roses in your garden. When you cross a t

Question

You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! What can you conclude from these results?

There is no recessive allele for the red pigment gene. The red allele is dominant to the yellow allele. There are epistatic interactions between at least two genes for rose pigment. There is a mutation in the gene for yellow pigment in the "Jealousy" variety. The environment, and not genes, influences pigment in these rose varieties.

Explanation / Answer

There are epistatic interactions between at least two genes for rose pigment.

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