Twin, Adoption, and Family Methods as Approaches to the Evolution of Individual Differences
Nancy L. Segal
Individual differences in behavior have been of great concern to behavioral geneticists whose interests span a wide range of phenotypes. Individual behavioral variation has, however, received less attention from evolutionarily-minded investigators. These two approaches have generally proceeded apart, yet this has started to change as each stands to gain from contact with the other. This chapter provides a brief overview of these two disciplines and their current relationship with one another. It then reviews the biological bases of twinning, twin and adoption research methods, and studies that have used behavioral-genetic methods to address selected evolutionary questions. The chapter discusses the implications of the findings for understanding individual differences within an evolutionary framework and concludes with a look at future research directions.
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