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In cattle, roan coat color is an example of an autosomal, co-dominant phenotype. Roan (CrCw) cattle...

In cattle, roan coat color is an example of an autosomal, co-dominant phenotype. Roan (CrCw) cattle are produced from the mating of a white (CwCw) cow to a red cow (CrCr). Predict the phenotypic and genotypic frequencies of offspring from each of the following crosses:

Roan x White                                                        3. Red x White

Roan x Red                                                           4. Roan x Roan

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Answer #1

Roan cow = CrCw
White cow = CwCw
Red cow = CrCr

1. Roan x White
CrCw x CwCw
Genotypic Ratio = CrCw + CrCw + CwCw + CwCw
Phenotypic Ratio = 2 Roan + 2 White

2. Roan x Red
CrCw x CrCr
Genotypic Ratio = CrCr + CrCr + CwCr + CwCr
Phenotypic Ratio = 2 Roan + 2 Red

3. Red x White
CrCr x CwCw
Genotypic Ratio = CrCw + CrCw + CrCw + CrCw
Phenotypic Ratio = 4 Roan

4. Roan x Roan
CrCw x CrCw
Genotypic Ratio = CrCr+ CrCw + CwCr + CwCw
Phenotypic Ratio = 1 Red + 2 Roan + 1 White

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