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Mutation, Gene Flow, and Genetic Drift01:09

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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Updated: Dec 11, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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How Much Does N Vary Among Species?

Nicolas Galtier1, Marjolaine Rousselle2,3

  • 1Institute of Evolution Sciences of Montpellier (ISEM), CNRS, University of Montpellier, IRD, EPHE, 34095 Montpellier, France nicolas.galtier@umontpellier.fr.

Genetics
|August 26, 2020
PubMed
Summary

Genetic drift

Keywords:
distribution of fitness effectsgenetic driftmutation loadpopulation sizesite-frequency spectrum

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Genetic drift is a key evolutionary force, but its impact varies across species.
  • Quantifying the strength of genetic drift and its effect on genome diversity is challenging.

Purpose of the Study:

  • To assess the variation in genetic drift strength across animal species.
  • To infer the distribution of fitness effects for deleterious mutations.

Main Methods:

  • Analysis of nonsynonymous and synonymous allele frequency spectra in metazoan species.
  • Comparison between primates and fruit flies to highlight differences in drift effects.
  • Application of a Gamma + lethal mutation model to estimate drift power.

Main Results:

  • A Gamma model alone is insufficient; including lethal mutations improves accuracy.
  • The power of genetic drift varies by at least 500-fold between large and small populations.
  • This variation in drift power is significantly larger than observed variation in genetic diversity.

Conclusions:

  • The effective population size (N) parameter's meaning in population genomics warrants re-evaluation.
  • Findings offer insights into Lewontin's paradox and the forces shaping genome evolution.
  • Deleterious mutation effects and their interaction with drift are crucial for understanding species-specific evolutionary trajectories.