A cattle farmer genetically crosses a cow (female) with a white coat with a bull (male) with a
red coat. The resulting calf (offspring) is roan, which means there are red and white hairs
intermixed in the coat of the calf. The genes for coat color in cattle are co-dominant.
Part A: Although a farm has cattle in all three colors, the farmer prefers roan cattle over
white or red cattle. Use a Punnett square to show a cross that would produce only roan offspring.
Part B: Explain how a roan calf results from one white- and one red-coated parent. In
your explanation, use letters to represent genes. Be sure to indicate what colors the
letters represent.
Part C: Predict the possible genotypes and phenotypes of the offspring produced from
two roan cattle.
