Genetic Question?

Question

In Shorthorn cattle, both red coat color and white coat color are true breeding. Crosses of red X white produce progeny that are uniformly reddish brown but thickly sprinkled with white hairs; this tpe of coat color is called "roan". Crosses of roan X roan produce 1/4 red: 1/2 roan: 1/4 white. What kind of genetic hypothesis can explain these data?

Answer 1

Red and white coats are codominant.