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PATTERNS OF POSTZYGOTIC ISOLATION IN FROGS.

Mahmood M Sasa1,2, Paul T Chippindale1, Norman A Johnson1

  • 1Department of Biology, The University of Texas at Arlington, Arlington, Texas, 76019.

Evolution; International Journal of Organic Evolution
|June 1, 2017
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Genetic divergence correlates with reproductive isolation in frogs. Hybrid sterility evolves faster than inviability, suggesting a general pattern for animal speciation.

Keywords:
Anuracomparative methodfrogsreproductive isolationspeciation

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Speciation

Background:

  • Reproductive isolation is key to speciation.
  • Understanding the genetic basis of reproductive isolation is crucial.

Purpose of the Study:

  • To investigate the relationship between genetic divergence and postzygotic isolation in anurans.
  • To compare the evolution of hybrid sterility and inviability in frogs with other animal groups.

Main Methods:

  • Literature review of 116 taxa crosses from 46 frog species.
  • Analysis of Nei's genetic distance (D) as a measure of divergence.
  • Correlation analysis between genetic distance and postzygotic isolation levels.

Main Results:

  • A positive correlation was found between genetic distance (D) and postzygotic isolation.
  • Hybrid sterility evolves more rapidly than hybrid inviability in anurans.
  • A genetic distance threshold of D = 0.30 for hybrid inviability was observed, similar to Drosophila.

Conclusions:

  • Genetic divergence is a reliable predictor of postzygotic isolation in frogs.
  • The findings suggest a conserved pattern in the evolution of reproductive isolation across diverse animal taxa.
  • This study provides insights into the mechanisms driving speciation in amphibians.