A geneticist is studying the inheritance of a trait in pea plants. He crosses a true-breeding purple-flowered plant with a true-breeding white-flowered plant and observes the following offspring: 100 purple-flowered, 100 white-flowered. Which of the following is the most likely ratio of genotypes in the offspring?

Core Concept

In the F2 generation of a monohybrid cross, a 1:1 ratio of dominant to recessive alleles is expected. However, in this case, we are observing a 1:1 ratio of purple-flowered to white-flowered offspring. This suggests that the offspring are heterozygous, and the correct ratio of genotypes is 100 Pp, 100 pp.