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Parallel genetic evolution and speciation from standing variation.

Ken A Thompson1, Matthew M Osmond2, Dolph Schluter1

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|July 11, 2019
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Summary
This summary is machine-generated.

Genetic adaptation from standing variation shows less parallel evolution as selection directions diverge. Adaptation from standing variation can slow speciation under parallel selection but speed it up under divergent selection.

Keywords:
Adaptationparallel evolutionspeciationtheory

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Speciation research

Background:

  • Adaptation commonly arises from existing genetic variation.
  • Natural selection can act in parallel or divergent ways between populations.
  • The influence of selection direction differences on adaptation from standing variation is not well understood.

Purpose of the Study:

  • To investigate how differing selection directions impact parallel genetic evolution during adaptation from standing variation.
  • To determine if standing variation affects speciation progress differently based on selection direction divergence.

Main Methods:

  • Theoretical modeling of adaptation in two populations.
  • Analysis of genetic parallelism under varying selection regimes.
  • Evaluation of hybrid fitness and speciation rates.

Main Results:

  • Parallel genetic evolution significantly decreases as selection directions diverge.
  • This decline in parallelism is more pronounced in organisms with more traits.
  • Adaptation from standing variation enhances hybrid fitness under parallel selection but reduces it under divergent selection.

Conclusions:

  • Differences in selection direction rapidly reduce genetic parallelism from standing variation.
  • Adaptation from standing variation can impede speciation when selection is parallel but accelerate it when selection is divergent.