Biology 3rd Edition by Peter Russell, Paul Hertz, Beverly McMillan

Exercise 8

In guinea pigs, an allele for rough fur (R) is dominant over an allele for smooth fur (r)an allele for black coat (B) is dominant over that for white (b)You have an animal with rough, black fur.What cross would you use to determine whether the animal is homozygous for these traits? What phenotype would you expect in the offspring if the animal is homozygous?