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If you cross two roan cows, what percentage of the progeny would you expect to be roan?

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If you cross two roan cows, what percentage of the progeny would you expect to be roan?

(a) 10%

(b) 25%

(c) 50%

(d) 75%

I had been asked this question in an interview for job.

The question is from Incomplete Dominance and Codominance in portion Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

1 Answer

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Best answer
The correct choice is (c) 50%

Easy explanation: Roan coat colour in short horn cattle is a codominant trait n which case the roan cows are heterozygous for the coat colour gene. Thus according to monohybrid ratio ½ the progeny of the cross will be heterozygote, hence, roan.

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