16. The Punnett square is a diagram that biologists use to determine the probability of offspring having certain genetic makeup. Suppose that represents the gene for brown eyes and represents the gene for blue eyes. In genetics, capital letters refer to dominant traits, so a person receiving both and generally has brown eyes. This diagram shows the possibilities for the child of two parents. Each parent gives the child one of its two genes with equal probability. What is the probability that this child will receive the genetic makeup for brown eyes? Discuss how this relates to Example 2 (page 346).