In a cattle breed, red coat colour is homozygous RR, white coat colour is WW, and roan is RW. What phenotypic ratio is expected from mating two roan cattle?
Correct answer: A. 1 red:2 roan:1 white
- A. 1 red:2 roan:1 white
- B. 3 red:1 white
- C. 1 red:1 roan
- D. 2 roan:1 white
Explanation
Each roan parent produces R and W gametes in equal numbers. Their offspring are expected in the genotypic ratio RR:RW:WW of 1:2:1, giving the same phenotypic ratio.
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