Question

The Shorthorn breed of cattle carries the gene WW for white coat color, and the gene ww for red coat color. When a white individual is bred with a red individual the hybrid result is a roan Ww that has a mixture of red and white coat color. Part A What is the dominance pattern for the roan color? Part B How does the roan color come about?

Answer 1

The roan color in Shorthorn cattle is due to codominance, where both the white and red genes are expressed in the Ww heterozygote, resulting in patches of both colors.

Step-by-step explanation:

The dominance pattern for the roan color in Shorthorn cattle is an example of codominance, where both the white and red coat color genes (W and w respectively) are expressed simultaneously in the heterozygote (Ww). The roan coat color is distinct and intermediate between the homozygous white (WW) and red (ww) individuals, showing patches of white and red rather than a blend of the two colors. This is because the roan phenotype occurs as a result of both alleles being expressed in different areas of the coat, rather than one allele being dominant over the other.

Answer 2

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