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Human sexual orientation has a heritable component

R C Pillard1, J M Bailey

  • 1Department of Psychiatry, Boston University School of Medicine, MA 02118, USA.

Human Biology
|April 29, 1998
PubMed
Summary
This summary is machine-generated.

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Behavioral genetics research suggests sexual orientation has a significant genetic component. Studies indicate genes may explain over half the variance in both homosexual and heterosexual orientations.

Area of Science:

  • Behavioral Genetics
  • Human Sexuality
  • Evolutionary Psychology

Background:

  • Sexual orientation is a complex human trait.
  • Understanding the genetic underpinnings of sexual orientation is crucial.

Purpose of the Study:

  • To review behavioral genetics research on homosexual and heterosexual orientation.
  • To explore the genetic and evolutionary factors influencing sexual orientation.

Main Methods:

  • Review of family, twin, and adoptee studies.
  • Analysis of concordance rates for sexual orientation.
  • Examination of evolutionary mechanisms related to sexual orientation.

Main Results:

  • Homosexual and heterosexual orientations show familial aggregation.

Related Experiment Videos

  • Genetic factors likely account for at least 50% of the variance in sexual orientation.
  • Homosexual behavior is observed in animals, but its relevance to human sexual orientation is uncertain.

    • Conclusions:

    • Sexual orientation has a substantial genetic basis.
    • Evolutionary mechanisms may explain the persistence of homosexual orientation in populations.
    • Further research is needed to clarify the genetic architecture and evolutionary dynamics of human sexual orientation.