if the feather color is determined by both dominant gene, then incomplete dominance is the likely explanation for these results.
Incomplete dominance results from a cross in which each parental contribution is genetically distinct and produces progeny with an intermediate phenotype. Semi-dominance and partial dominance are other terms for incomplete dominance. Mendel defined dominance but not partial dominance.
It is also referred to as partial dominance. In roses, for example, the allele for red color predominates over the allele for white color.
Codominance implies that no allele can prevent or mask the expression of the other allele. Incomplete dominance, on the other hand, is a condition in which a dominant allele does not completely mask the effects of a recessive allele.
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