Look at the two cacti in Figure 17-11. Both the leafy Pereskia in part a and the

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Look at the two cacti in Figure 17-11. Both the leafy Pereskia in part a and the very desert-adapted Gymnocalycium in part b evolved from the same ancestors—leafy trees that were not themselves cacti. In which genus, Pereskia or Gymnocalycium, has natural selection favored more of the new alleles produced by mutations? In which genus has natural selection retained more of the original alleles and eliminated almost all of the new alleles produced by mutation?

Figure 17-11

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