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1 - Evolutionary Theory

Published online by Cambridge University Press:  05 August 2012

By
Douglas J. Futuyma
Edited by
Michael P. Muehlenbein
Michael P. Muehlenbein
Affiliation:
Indiana University, Bloomington
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Summary

Our contemporary understanding of evolutionary processes builds on theory developed during the “Evolutionary Synthesis” of the 1930s and 1940s, when Darwin's ideas, especially on natural selection, were joined with Mendelian genetics. Since, then, of course, our understanding of evolution has been greatly advanced by the discoveries in molecular genetics, as well as by continuing elaboration of the “neo-Darwinian” theory that issued from the Evolutionary Synthesis (Futuyma, 1998, 2009).

A capsule summary of contemporary theory, to be followed by more detailed explication, is as follows. Elementary evolutionary change consists of changes in the genetic constitution of a population of organisms, or in an ensemble of populations of a species. These genetic changes may be reflected in change of the population mean or variance of phenotypic characteristics. Any change requires that genetic variation originate by mutation of DNA sequences, and/or by recombination. The minimal evolutionary process is an increase in the frequency of a mutation, or a set of mutations, within a population, and the corresponding decrease in frequency of previously common alleles. Such frequency changes are the consequence of random genetic drift (leading to occasional fixation of nearly neutral genetic variants) or of diverse forms of natural selection. Successive such changes in one or more characteristics cumulate over time, yielding potentially indefinite divergence of a lineage from the ancestral state. Different populations of a species retain similarity due to gene flow and perhaps uniform selection, but can diverge due to differences in mutation, drift, and/or selection.

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Human Evolutionary Biology , pp. 3 - 16
Publisher: Cambridge University Press
Print publication year: 2010

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