The Unit of Natural Selection

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There much debate about this question of the unit of natural selection. Some earlier writers that the characteristic groups that up populations as such. While this theoretically conceivable, every writer who the problem that in nature it a very rare event and certainly not a common factor in the evolution of animal traits. Characteristics of groups, like the characteristics of species, by most theorists today the result of the selection of genes as they themselves in the individuals populations (Williams, 1966; Lewontin, 1970; Wilson, 1975).