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Chance, Variation and Shared Ancestry: Population Genetics After the Synthesis

  • Michel VeuilleEmail author
Original Research
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Abstract

Chance has been a focus of attention ever since the beginning of population genetics, but neutrality has not, as natural selection once appeared to be the only worthwhile issue. Neutral change became a major source of interest during the neutralist–selectionist debate, 1970–1980. It retained interest beyond this period for two reasons that contributed to its becoming foundational for evolutionary reasoning. On the one hand, neutral evolution was the first mathematical prediction to emerge from Mendelian inheritance: until then evolution by natural selection was considered the alternative to the fixity of species; now it appears to be the alternative to continuous change. Second, neutral change generated a set of clear predictions on standing variation. These could be used as a reference for detecting more elusive alternative mechanisms of evolution including natural selection. In the wake of the transition from Mendelism to genomics, the combination of coalescent theory, DNA sequence variation, and numerical analysis made it possible to integrate contingent aspects of the history of species into a new null model, thus opening a new dimension in the concept of population that the Modern Synthesis formerly considered as a mere gene pool.

Keywords

Population genetics Modern synthesis Neutral evolution Natural selection 

Notes

Acknowledgments

This study is dedicated to Jean Gayon (1949–2018) and was inspired by a series of seminars held in the Muséum National d’Histoire Naturelle, Paris, in June 2016 by Jean and myself on the evolution of evolutionary theory in the last half-century. I am greatly indebted to Richard Burian, Michael Dietrich, Jean-Baptiste Grodwohl, and Philippe Huneman for comments that greatly improved the manuscript. I thank Guillaume Achaz, Claudine Cohen, David Depew, Maureen O’Malley, Anya Plutinsky, and Amir Yassin for kindly commenting on former versions and exchanging ideas.

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Authors and Affiliations

  1. 1.Institut Systématique Évolution Biodiversité (ISYEB, UMR 7205, CNRS, EPHE, MNHN, UPMC), Ecole Pratique des Hautes Etudes, Université Paris Sciences LettresParisFrance

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