Question

In cattle, roan color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of...

In cattle, roan color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. When two roan cattle are crossed, the phenotypes of the progeny are found to be in the ratio of one red: two roan: one white. Which of the following crosses could produce the highest percentage of roan cattle?

a) red x white; b) roan x roan; c) white x roan; d) red x roan e) all of the above crosses would give the same percentage of roan.

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Answer #1

Ans.

a) red × white

Explanation :

From the above crosses it can be concluded that the cross between red (RR) and white (rr) produces the highest percentage of roan (Rr) cattle.

Cross between red (RR) and white (rr) produces 100% of roan cattle.

Therefore, the answer is a) red × white

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