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Transgressive segregation, adaptation and speciation.

L H Rieseberg1, M A Archer, R K Wayne

  • 1Department of Biology, Indiana University, Bloomington, IN 47405, USA. lriesebe@indiana.edu

Heredity
|December 3, 1999
PubMed
Summary
This summary is machine-generated.

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Transgressive segregation, producing extreme phenotypes in hybrids, is common across species. This phenomenon, often driven by complementary genes, fuels rapid adaptation and evolutionary novelty in hybrid lineages.

Area of Science:

  • Evolutionary biology
  • Genetics

Background:

  • Hybridization can lead to novel phenotypes.
  • Transgressive segregation (TS) produces extreme traits in hybrid offspring.

Purpose of the Study:

  • Assess the frequency and genetic basis of TS.
  • Identify factors predicting TS occurrence.

Main Methods:

  • Surveyed 171 studies on phenotypic variation in segregating hybrid populations.
  • Analyzed 1229 traits for transgression.

Main Results:

  • TS is prevalent (91% of studies, 44% of traits).
  • TS is most frequent in domesticated plant intraspecific crosses.
  • Complementary genes are the primary cause, with overdominance and epistasis also contributing.

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Conclusions:

  • Hybridization is a significant source of evolutionary novelty.
  • TS provides raw material for rapid adaptation and niche divergence.