Genetic Evidence for Multiple Biological Mechanisms Underlying In-Group Favoritism

@article{Lewis2010GeneticEF,
  title={Genetic Evidence for Multiple Biological Mechanisms Underlying In-Group Favoritism},
  author={Gary J. Lewis and Timothy C. Bates},
  journal={Psychological Science},
  year={2010},
  volume={21},
  pages={1623 - 1628}
}
In-group favoritism is ubiquitous and associated with intergroup conflict, yet is little understood from a biological perspective. A fundamental question regarding the structure of favoritism is whether it is inflexibly directed toward distinct, “essentialist” categories, such as ethnicity and race, or is deployed in a context-sensitive manner. In this article, we report the first study (to our knowledge) of the genetic and environmental structure of in-group favoritism in the religious, ethnic… 
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