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Dynamics of polygenic variability under stabilizing selection, recombination, and drift

S Gavrilets1, A Hastings

  • 1Division of Environmental Studies, University of California, Davis 95616, USA.

Genetical Research
|February 1, 1995
PubMed
Summary

Random drift, not strong stabilizing selection, likely reduces genetic variability in populations. The interaction of selection, recombination, and drift influences the dynamics of genotypic variance (Vg) and linkage disequilibrium (CL).

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Area of Science:

  • Evolutionary genetics
  • Quantitative genetics
  • Population genetics

Background:

  • Understanding the factors influencing genetic variation is crucial for evolutionary studies.
  • Stabilizing selection, recombination, and random drift are key evolutionary forces acting on quantitative traits.

Purpose of the Study:

  • To investigate the transient dynamics of genotypic variance for an additive trait.
  • To analyze the interplay between stabilizing selection, recombination, and random drift.
  • To determine how these factors shape the components of genotypic variance.

Main Methods:

  • Analytical modeling of genetic variance dynamics.
  • Numerical simulations of evolutionary processes.
  • Interpretation of experimental results from artificial selection.

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Main Results:

  • The interaction of evolutionary forces dictates the dynamics of genic variance (Vg) and linkage disequilibrium (CL).
  • System dynamics typically converge to a line in the (Vg, CL) plane, followed by slow evolution.
  • The ratio of population size (N) to the number of loci (n) significantly impacts Vg dynamics.

Conclusions:

  • Random drift, rather than strong stabilizing selection, is the probable cause of reduced genetic variability in artificial selection experiments.
  • Stabilizing selection acts slowly in removing polygenic variability from populations.
  • The interplay of drift, selection, and recombination provides a comprehensive framework for understanding genetic variance dynamics.