Abstract
STUDY of statistical differences among local populations is important
line of attack on the evolutionary problem. While such differences can
only rarely represent first steps toward speciation in the sense of the splitting
of the species, they are important for the evolution of the species as a whole.
They provide a possible basis for intergroup selection of genetic systems, a
process that provides a more effective mechanism for adaptive advance of the
species as a whole than does the mass selection which is all that can occur
under panmixia.
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