The color of chickens is determined by interacting loci: aa or aa give white, aabb or aabb give colored, and aabb produces white. describes the epistatic interactions occuring between these two genes

In Epistatis interactions, the effect of one gene is dependent on the presence of other 2 or more genes. Each gene locus had an independent effect on a single phenotype. Therefore, the R and r alleles affected solely the form of the seed and had no influence on seed color, whereas the Y and y alleles affected solely seed color and had no influence on seed form. during this case, there have been 2 separate genes that coded for 2 separate characteristics.

Thus, Epistasis interaction would account for these results.