How does the complementary interaction of genes affect the manifestation of body characteristics?

The complementary interaction of dominant or recessive alleles determines the development of a new trait that is different from the parental variants. The manifestation of this trait usually coincides with the wild type. For example, when fruit flies of Drosophila with bright red eyes and flies with brown eyes are crossed, dull red eyes are a sign of the wild type in all hybrids of the first generation.

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