In cattle, the alleles for red coat colour (R) and for white coat colour (r) behave as codominants. When a red-coated an

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In cattle, the alleles for red coat colour (R) and for white
coat colour (r) behave as
codominants. When a red-coated animal is crossed with a
white-coated one, an animal
with both red and white hairs is produced. Thus the heterozygote is
intermediate or roan
coloured. If a breeder has all three genotypes of cows and bulls,
what would be the
phenotype and genotype ratios in the F2 generation for each of the
following crosses?
a. roan x roan
b. red x roan
c. red x white