For shorthorn cattle the mating of a red bull and a white

Last updated: 1/2/2023

For shorthorn cattle the mating of a red bull and a white cow produces a calf that is described as roan Roan is intermingled red and white hair Many matings between roan bulls and roan cows produce cattle in the following ratio 1 red 2 roan 1 white Is this a problem of codominance or multiple al eles Explain your answer