I have a homework question and needed a little help:
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 type 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?

I understand this question in the context of crosses:
1. Red Coat (RR) x White Coat (WW) = 100% Roan (RW)
2. Roan (RW) x Roan (RW) = 1 RR (Red), 1 WW (White), 2 RW (Roan)

But is there a specific hypothesis or certain name for this?