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16 January, 13:43

In shorthorn cattle, when a red bull (R R) is crossed with a white cow (W W), all the offspring are roan-a spotted, red and white color.

What genotypes are expected from mating a roan bull and a roan cow?

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  1. 16 January, 17:04
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    RR, RW, RW, WW

    Explanation:

    This is an example of codominance, in which both alleles for a trait are expressed in the offspring. Do not confuse this with incomplete dominance in which the alleles blend; otherwise, the roan would have been pink. By crossing a red bull and white cow, we get the genotype of RW for a roan. This will be the genotype of all offspring.

    What happens if you cross an RW with an RW? You get RR, RW, RW, and WW; in other words, you get 1 red, 2 roan, and 1 white offspring.
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