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How can psychological adaptations be heritable?

J M Bailey1

  • 1Department of Psychology, Northwestern University, 209 Sheridan Road, Evanston, IL 60208-2710, USA.

Novartis Foundation Symposium
|March 30, 2001
PubMed
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Selection depletes genetic variation, yet psychological traits show heritability. Factors like antagonistic pleiotropy and environmental variability may maintain this variation for traits like intelligence.

Area of Science:

  • Evolutionary psychology
  • Behavioral genetics

Background:

  • Fisher's fundamental theorem states selection depletes additive genetic variation.
  • Psychological traits often exhibit moderate heritabilities despite intense selection.
  • Traits like sociosexuality, schizophrenia, and sexual orientation are under strong sexual selection.

Purpose of the Study:

  • To explore mechanisms maintaining genetic variation for psychological traits.
  • To discuss the role of evolutionary factors in heritable variation for intelligence.
  • To review evolutionary hypotheses for variation in specific psychological traits.

Main Methods:

  • Theoretical discussion of evolutionary principles.
  • Review of existing literature on genetic variation and psychological traits.

Related Experiment Videos

  • Analysis of factors influencing heritability.

    • Main Results:

    • Several factors can maintain genetic variation, including antagonistic pleiotropy, varying selection pressures, mutation, and heritable strategic variation.
    • These factors are discussed in the context of intelligence and other psychological traits.
    • Evolutionary hypotheses for trait variation are examined.

    Conclusions:

    • Genetic variation for psychological traits can be maintained by multiple evolutionary mechanisms.
    • Understanding these mechanisms is crucial for explaining the heritability of complex human behaviors.
    • Further research into evolutionary hypotheses can illuminate the genetic architecture of psychological diversity.