Punnett square help please!!!!!?

in cattle the polled or hornless trait is caused by a dominant gene H, and the horned trait by its recessive allele h. Fur color is controlled by a gene that exhibits incomplete dominance, R codes for red, r for white, and the Rr combination codes for roan (a mix of red and white). use a punnett square to derive phenotypic rations expected for offspring produced from a mating between a heterozygous hornless roan bull and a cow that is also heterozygous hornless and roan.