Genetic Divergence in Adaptive Characters Between Sympatric Species of Stickleback

  title={Genetic Divergence in Adaptive Characters Between Sympatric Species of Stickleback},
  author={Todd Hatfield},
  journal={The American Naturalist},
  pages={1009 - 1029}
  • T. Hatfield
  • Published 1 June 1997
  • Biology
  • The American Naturalist
This study explored the genetic basis of phenotypic differences between two sympatric species of ecologically and morphologically divergent sticklebacks (Gasterosteus aculeatus complex). The aim was to understand how many loci determine the differences and to what extent the differences are due to additive or nonadditive gene action. I reared the two parental species, F1 and F2 hybrids, and both backcrosses in the laboratory and measured the following quantitative characters: gill raker number… 

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