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10 February, 00:49

Roan coat color in cattle develops through incomplete dominance of the gene for red color and its allele for white. what crossing combination will yield a herd of true-breeding, roan-colored cattle?

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  1. 10 February, 04:48
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    Roan is a combination of white hairs with red hairs. When we see cattle like this, they look pink because it resulted from a mix of white and red.

    Red allele: A

    White allele: a

    A heterozygotic animal has this genotype: Aa

    Like i said previously this is the mixture of colors so the animal would be pink.

    A red coat color has this genotype: AA

    A white coat color has this genotype: aa

    To get all the herd to be roan-colored cattle the combination of parents should be: AA x aa. - > 100% roan

    Another possible way to obtain would be roan-colored cattle: Aa x Aa or aa x Aa (in this case there would be less probabable to obtain road).
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