Genetics: Analysis and Principles 4th Edition by Robert Brooker

Exercise 7

Duroc Jersey pigs are typically red, but a sandy variation is also seen. When two different varieties of true-breeding sandy pigs were crossed to each other, they produced F 1 offspring that were red. When these F 1 offspring were crossed to each other, they produced red, sandy, and white pigs in a 9:6:1 ratio. Explain this pattern of inheritance.