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Related Experiment Videos

Neutral behavior of shared polymorphism

A G Clark1

  • 1Institute of Molecular Evolutionary Genetics, Department of Biology, 208 Mueller Laboratory, Pennsylvania State University, University Park, PA 16802, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 22, 1997
PubMed
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Shared genetic polymorphism is lost faster in two species than in one, with an expected loss time of 1.7N generations. This study models shared polymorphism dynamics using the neutral Wright-Fisher model and order statistics.

Area of Science:

  • Population Genetics
  • Evolutionary Biology
  • Molecular Evolution

Background:

  • Genetic polymorphism can be shared between species.
  • Understanding the dynamics of shared polymorphism is crucial for evolutionary studies.

Purpose of the Study:

  • To examine the distribution of times to random loss of shared polymorphism.
  • To model shared polymorphism using the neutral Wright-Fisher model and diffusion approximation.
  • To determine the probability of shared allelic lineages by chance.

Main Methods:

  • Utilizing order statistics to derive the distribution of times to loss of shared polymorphism.
  • Applying Kimura's solution to the diffusion approximation of the Wright-Fisher model.
  • Analyzing molecular sequences to count shared polymorphic sites.

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Main Results:

  • The expected time for loss of a shared polymorphism in two species is 1.7N generations, which is shorter than the 2.77N generations for loss in a single species.
  • The distribution of the number of shared polymorphic sites was obtained.
  • Shared polymorphism is more probable at genetic loci with a higher number of segregating alleles.

Conclusions:

  • Shared polymorphisms are lost more rapidly than polymorphisms within a single species.
  • The neutral coalescent model is effective for predicting the probability of chance shared allelic lineages.
  • The findings provide insights into the evolutionary processes underlying shared polymorphism.