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PHASE THREE OF WRIGHT'S SHIFTING-BALANCE THEORY.

J F Crow1, W R Engels1, C Denniston1

  • 1Laboratory of Genetics, University of Wisconsin, Madison, WI, 53706.

Evolution; International Journal of Organic Evolution
|June 1, 2017
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Summary
This summary is machine-generated.

Migration effectively spreads beneficial gene combinations, supporting Wright's shifting-balance theory of evolution. This process, even with low migration rates, facilitates the fixation of favorable dominant or recessive alleles within populations.

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Wright's shifting-balance theory proposes that migration facilitates the spread of advantageous gene combinations.
  • The third phase, gene fixation via migration, is crucial for adaptive evolution.

Purpose of the Study:

  • To numerically examine the effectiveness of migration in spreading favorable gene combinations.
  • To test the robustness of Wright's theory under various genetic models and migration rates.

Main Methods:

  • Deterministic equations modeling gene flow and selection.
  • Numerical simulations of populations with 2-9 loci.
  • Analysis of fixation probabilities for dominant and recessive favorable alleles.

Main Results:

  • Favorable gene combinations, especially dominant ones, are efficiently fixed even with low migration rates.
  • Two-way migration does not significantly impede the fixation process.
  • The effectiveness of migration is largely independent of the selection coefficient magnitude.

Conclusions:

  • The third phase of Wright's shifting-balance theory is robust and supported by numerical evidence.
  • Migration plays a significant role in adaptive evolution by disseminating favorable genotypes.
  • The theory's proposed mechanism for gene fixation via migration is validated.