Some biologists regard our bodies as small ecosystems that exert selective pressure for the evolution of invasive metastatic cancer. If this is true, why don’t we all get cancer? (Hint: Consider the speed of evolution.) However, these same biologists believe that humans have certain genes that have evolved specifically to prevent cancer. How is it possible to have both strong selection for cancer and strong selection for anticancer genes? (Hint: Consider which population is under selection in each case.)
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