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Frequency- and density-dependent selection on a quantitative character.

M Slatkin1

  • 1Department of Zoology, NJ-15, University of Washington, Seattle, Washington 98195.

Genetics
|November 1, 1979
PubMed
Summary
This summary is machine-generated.

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Frequency- and density-dependent selection shapes quantitative traits. The equilibrium distribution of normally distributed traits is independent of the genetic model, provided it doesn't constrain mean and variance.

Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics

Background:

  • Quantitative traits are influenced by multiple genetic and environmental factors.
  • Frequency- and density-dependent selection can alter trait distributions within populations.

Purpose of the Study:

  • To investigate the equilibrium distribution of a quantitative character under frequency- and density-dependent selection.
  • To compare different genetic models affecting trait distributions.

Main Methods:

  • Analysis of three genetic models: one-locus, continuous genotype, and correlation models.
  • Mathematical modeling of trait evolution under selection pressures.

Main Results:

  • Continuous genotype and correlation models yield identical equilibrium values for population size, mean, and variance.

Related Experiment Videos

  • One-locus models produce different equilibrium values due to inherent mean-variance constraints.

    • Conclusions:

    • The equilibrium distribution of a normally distributed quantitative character under frequency- and density-dependent selection is model-independent.
    • This independence holds as long as the genetic model does not impose constraints on the trait's mean and variance.