3 pie charts are shown. The first is labeled Generation 1 and has about 33 percent Beak X, 33 percent Beak Y, and 33 percent Beak Z. The second labeled Generation 5 has about 33 percent Beak Y and 66 percent Beak Z. The third labeled Generation 10 has 60 percent Beak Z, 30 percent Beak Y, and 10 percent Beak X. The graphs above show a change in distribution of beak phenotypes X, Y, and Z over 10 generations. Notice that Beak X completely disappears from the population by Generation 5, but reappears by Generation 10. Could this occur in nature? How? Yes, the alleles for Beak X could remain in the population as a recessive gene. Yes, the birds could mutate their beaks in response to a change in the environment. Yes, genetic mutation is so frequent that Beak X will likely reappear randomly by Generation 10. No, once birds with Beak X are extinct, they cannot appear again.