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A dual level model for speciation by multiple pericentric inversions.

M King1

  • 1Museum of Arts and Sciences, Darwin, Australia.

Heredity
|May 1, 1992
PubMed
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Pericentric inversions can contribute to speciation by overcoming meiotic issues in hybrids, leading to genetic divergence. Multiple inversions create strong reproductive barriers, acting as significant post-mating isolating mechanisms.

Area of Science:

  • Genetics
  • Evolutionary Biology
  • Reproductive Biology

Background:

  • Pericentric inversions can cause meiotic problems in hybrid offspring.
  • Overriding mechanisms like altered chiasma location can mitigate these effects.
  • The role of pericentric inversions in speciation is debated, with some arguing they are negated by these mechanisms.

Purpose of the Study:

  • To re-evaluate the role of pericentric inversions in speciation.
  • To propose a two-level model for how pericentric inversions contribute to reproductive isolation.
  • To investigate the impact of overriding mechanisms on inversion fixation and subsequent speciation.

Main Methods:

  • The study is theoretical, drawing on existing evidence and evolutionary principles.
  • It analyzes the interplay between meiotic effects, overriding mechanisms, and population genetics.

Related Experiment Videos

  • The concept of coadapted gene complexes is used to explain second-level effects.

    • Main Results:

    • Overriding mechanisms facilitate the fixation of pericentric inversions by reducing meiotic dysfunction in F1 hybrids.
    • Contact hybridization between populations with different inversions can lead to second-level effects.
    • Recombination between inverted and non-inverted segments disrupts coadapted gene complexes, causing inviability in later generations.

    Conclusions:

    • Pericentric inversions can play a dual role in speciation: facilitating their own spread and later acting as post-mating isolation barriers.
    • Multiple pericentric inversions are more likely to act as significant reproductive isolating mechanisms than single inversions.
    • This two-level model reconciles the potential for inversions to be both benign and potent drivers of speciation.