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Related Experiment Videos

Speciation despite gene flow when developmental pathways evolve.

Adam H Porter1, Norman A Johnson

  • 1Department of Entomology, Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts 01003, USA. aporter@ent.umass.edu

Evolution; International Journal of Organic Evolution
|December 19, 2002
PubMed
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Species formation can occur even with significant gene flow between populations. New models show developmental pathways facilitate genetic incompatibilities, promoting speciation despite high migration rates.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Developmental genetics

Background:

  • Species formation is thought to require reduced gene flow.
  • The precise rate of gene flow that prevents speciation is not well understood.
  • Existing models often simplify genetic architecture.

Purpose of the Study:

  • To investigate the role of gene flow in speciation using novel population genetic models.
  • To examine how developmental genetics influences the evolution of reproductive isolation.
  • To determine the critical factors (proportion vs. number of migrants) affecting speciation under gene flow.

Main Methods:

  • Developed new population genetic models incorporating simple developmental genetic rules.
  • Simulated parallel evolution of replicate populations towards a shared optimal phenotype.

Related Experiment Videos

  • Analyzed the impact of varying migration rates (m and Nm) on the evolution of postzygotic isolation and Dobzhansky-Muller incompatibilities.
  • Compared results with standard Dobzhansky-Muller models.

    • Main Results:

    • Postzygotic reproductive isolation and Dobzhansky-Muller incompatibilities frequently evolved, even with high gene flow (m up to 16 individuals/generation).
    • The proportion of migrants (m) was more critical than the absolute number (Nm) in inhibiting speciation.
    • Stronger directional selection increased speciation probability.
    • Developmental pathway models showed gene flow impeding speciation less than in simpler models.
    • Genetic incompatibilities arose as by-products of adaptive evolution in developmental pathways.

    Conclusions:

    • Developmental genetics plays a crucial role in facilitating speciation by generating genetic incompatibilities.
    • Speciation is possible even under substantial gene flow, particularly when influenced by developmental pathways.
    • Novel modeling approaches reveal that the architecture of development shapes the likelihood of species formation.