In shorthorn cattle, coat color may be red, white, or roan.Roan is an intermediate phenotype expressed as a mixture of red and white hairs. The following data was obtained from variouscrosses:
     red x red………all red
     white x white….all white
     red x white……..all roan
     roan x roan…….1/4 red; 1/2roan;1/4 white

How is coat color inherited? What are the genotypes of parentsand offspring of each cross?