Darwin and Wallace both observed greater species richness in the tropics than in Europe, but neither of them had a good explanation for why. One of the best-supported modern-day hypotheses to explain this pattern is that mutation rates are higher in the tropics than in temperate latitudes. Why would higher mutation rates lead to greater species richness

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C.

Marriages within stable geographical communities and the influx of few converts restricts the genetic pool of Amish society. Marriages sometimes occur between second cousins. Such intermarriage does not always produce medical problems. When unique recessive traits are common in a closed community certain diseases simply are more likely to occur. On the other hand, a restricted gene pool may offer protection from other hereditary diseases.