A gene that controls coat colour in cattle has 2 alleles; C^R (red) and C^W (white). The heterozygotes have a roan colour. If roan cattle are crossed to white cattle, which of the following phenotypic ratios would be expected in the offspring? A) 3 red : 1 white B) 1 red : 2 roan : 1 white C) 1 white : 1 roan D) 1 white : 1 roan : 1 red E) 2 white: 1 roan

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Quizplus · Accepted Answer

Since roan cattle are heterozygotes (having one red and one white allele) and white cattle have two white alleles, crossing them would result in offspring that are either white (from receiving a white allele from both parents) or roan (from receiving a white allele from the white parent and a red allele from the roan parent), leading to a 1 white : 1 roan ratio.

A Gene That Controls Coat Colour in Cattle Has 2