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Selection for recombination in structured populations.

Guillaume Martin1, Sarah P Otto, Thomas Lenormand

  • 1Zoology Department, University of British Columbia, Vancouver, V6T 1Z4 British Columbia, Canada.

Genetics
|June 10, 2005
PubMed
Summary
This summary is machine-generated.

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Population subdivision and genetic drift can drive the evolution of sex and recombination, even in large populations. This study shows that recombination offers a significant advantage in structured populations, overcoming the cost of sex.

Area of Science:

  • Evolutionary Biology
  • Population Genetics

Background:

  • The Hill-Robertson effect explains how genetic drift and selection interact to create linkage disequilibria, potentially favoring recombination.
  • Previous models suggested limited advantage of recombination in large, unstructured populations.

Purpose of the Study:

  • To investigate how population subdivision influences linkage disequilibrium and selection for recombination.
  • To quantify the impact of drift and selection on recombination in subdivided populations.

Main Methods:

  • Mathematical modeling of linkage disequilibrium and selection for recombination in subdivided populations.
  • Simulations to assess the strength of selection for recombination under varying migration rates and deme sizes.

Main Results:

Related Experiment Videos

  • Substantial linkage disequilibria accumulate in subdivided populations due to drift and selection.
  • Selection for recombination in subdivided populations is equivalent to that in a single population of intermediate size.
  • Recombination advantage is stronger in small demes with migration than in isolated or unstructured populations.

Conclusions:

  • Population structure significantly enhances the selection for sex and recombination.
  • Stochastic theories for the evolution of sex are applicable to a wider range of population structures than previously thought.
  • Migration in subdivided populations can maintain polymorphisms and generate sufficient linkage disequilibrium to favor recombination, even overcoming the cost of sex.