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Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Complete genetic linkage can subvert natural selection.

Philip J Gerrish1, Alexandre Colato, Alan S Perelson

  • 1Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA. pgerrish@unm.edu

Proceedings of the National Academy of Sciences of the United States of America
|April 5, 2007
PubMed
Summary

Genetic linkage can cause mutation rates to become dangerously high during adaptation. This occurs when genes influencing fitness and mutation rate are completely linked, potentially impacting evolution and disease.

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Area of Science:

  • Evolutionary biology
  • Genetics

Background:

  • Natural selection drives organismal adaptation to environments.
  • Features like genetic linkage can impede natural selection's efficiency, leading to suboptimal adaptations.
  • Darwin noted limitations to natural selection's effectiveness.

Purpose of the Study:

  • To theoretically investigate the impact of genetic linkage on natural selection.
  • To explore how complete linkage between fitness and mutation rate loci affects adaptation.
  • To identify potential negative consequences of this linkage on evolutionary processes.

Main Methods:

  • Theoretical modeling of genetic linkage.
  • Analysis of evolutionary dynamics under selection and mutation.
  • Simulation of populations with linked fitness and mutation rate loci.

Main Results:

  • Complete linkage between fitness and mutation rate loci can lead to intolerable mutation rates.
  • Positive natural selection combined with recurrent mutation can exacerbate this effect.
  • This phenomenon poses a significant challenge to adaptation in certain scenarios.

Conclusions:

  • Genetic linkage can have detrimental effects on adaptation by driving mutation rates to extreme levels.
  • Findings have implications for the evolution of recombination.
  • The evolutionary trajectory of asexual populations and pathogen clearance may be influenced by this mechanism.