iGenetics 3rd Edition by Peter Russell

Exercise 8

In guinea pigs, short hair ( L ) is dominant to long hair ( l ), and the heterozygous conditions of yellow coat ( C Y ) and white coat ( C W ) give cream coat. A shorthaired, cream guinea pig is bred to a long-haired, white guinea pig, and a long-haired, cream baby guinea pig is produced. When the baby grows up, it is bred back to the short-haired, cream parent. What phenotypic classes, and in what proportions, are expected among the offspring?