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A white cow is crossed with a red bull.The calf is neither white nor red but roan.Explain how this happens?
Wiki User
∙ 13y ago
It's called incomplete dominance or Co-dominance. The alleles for white and red cannot overpower one another (in other words, the red gene is never dominant over the white gene but both can occur at the same time) to make the calf either white or red, so instead the coat coloration of the calf has red and white hairs that are intermingled with each other.
Wiki User
∙ 13y ago
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