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Related Experiment Videos

Natural selection opposing artificial selection: a two-locus deterministic simulation.

F Minvielle1

  • 1Département de Zootechnie, Université Laval, Québec, Canada G1K 7P4.

Genetics
|May 1, 1981
PubMed
Summary
This summary is machine-generated.

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Artificial selection often prevails over natural selection, especially with major genes. Multiple outcomes and intermediate plateaus were observed in simulations of opposing selection pressures.

Area of Science:

  • Quantitative genetics
  • Evolutionary biology
  • Population genetics

Background:

  • Understanding the interplay between artificial and natural selection is crucial for predicting evolutionary trajectories.
  • Genetic architecture of traits influences the outcome of selection pressures.

Purpose of the Study:

  • To investigate the outcomes of artificial truncation selection opposing different modes of natural selection.
  • To identify conditions under which artificial selection overcomes natural selection.

Main Methods:

  • Numerical simulations of a two-locus, two-allele metric trait.
  • Modeling artificial truncation selection against directional selection, overdominance, and underdominance.
  • Analysis of outcomes in a large random-mating population over 100 generations.

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Main Results:

  • Selection limits were generally reached by generation 100.
  • Intermediate selection plateaus were observed, particularly with minor genes.
  • Multiple outcomes were common, with artificial selection often prevailing when alleles were in positive linkage disequilibrium or when major genes were involved.

Conclusions:

  • The outcome of opposing selection pressures depends on the genetic starting point and the genetic architecture of the trait.
  • Artificial selection can frequently overcome natural selection under specific conditions.
  • Further research is needed to explore the antagonism between artificial and natural selection.