Chapter 13: The Five Forces Behind Human Evolution

1998, 1999, 2000 Gregory CareyChapter 13: five Forces - 1 Chapter 13: The five Forces Behind Human EvolutionIntroductionFive different Forces have influenced Human Evolution : natural selection, randomgenetic drift, mutation, population mating structure, and culture. All evolutionary biologistsagree on the first three of these Forces , although there have been disputes at times about therelative importance of each force . The fourth and fifth Forces are new in the sense that theyare not explicated in more traditional texts. This is not an attempt to develop a new theory of Human Evolution . Instead, the Forces of population mating structure and cultureare arbitrary categorizations used to organize several different phenomena of humanevolution.

example of disruptive selection in human evolution. Despite its rarity, however, disruptive selection may be very important for the emergence of species. After suitable time, disruptive selection can lead to bimodal distributions that might eventually lead to different species. [Insert Figure 13.3 about here] The Effect of Natural Selection

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