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In breeding certain varieties of chickens, farmers found that chickens with black feathers always had chicks with black feathers, and the chickens with white feathers always had chicks with white feathers. But mating a black chicken with a white chicken produced chickens with dark gray feathers. How can this trait be explained?
This is known as incomplete dominance. This is when a cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits. White+Black=Gray
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Black feathers is a dominant trait, while white feathers is a recessive trait. Mating the two together will produce a chicken with both white and black traits, with black slightly dominant over white. This gives the chickens a slightly darker gray color.
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This is known as incomplete dominance. This is when a cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits. White+Black=Gray
References :