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Related Experiment Videos

Disequilibrium in some Cepaea populations.

L M Cook1

  • 1The Manchester Museum, University of Manchester, Oxford Road, Manchester M13 9PL, UK. lcook@machester.ac.uk

Heredity
|March 3, 2005
PubMed
Summary

Phenotypic disequilibrium in Cepaea nemoralis snails suggests selection favors common morph combinations. This directional selection, combined with migration, may explain the prolonged polymorphism observed in snail populations.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Ecology

Background:

  • Phenotypic disequilibrium and morph frequencies are key metrics in studying genetic polymorphism.
  • The snail Cepaea nemoralis exhibits significant polymorphism in shell color and banding patterns, making it a model organism for such studies.

Purpose of the Study:

  • To investigate the relationship between phenotypic disequilibrium and morph frequencies for color and banding loci in Cepaea nemoralis.
  • To determine if selection acts on specific combinations of morphs within snail populations.

Main Methods:

  • Analysis of a large, widespread dataset of Cepaea nemoralis shell color and pattern morph frequencies.
  • Examination of the correlation between phenotypic disequilibrium and the frequency of different morphs at color and banding loci.

Main Results:

  • A clear relationship was found between phenotypic disequilibrium and morph frequencies.
  • The direction of disequilibrium indicated selection favors combinations of common morphs, irrespective of which morphs are common.

Conclusions:

  • The observed patterns are consistent with selection acting on phenotypes in Cepaea nemoralis populations.
  • Directional selection on phenotypes, coupled with migration, can maintain prolonged genetic polymorphism in natural populations.

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