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The XYY genotype.

S Walzer, P S Gerald, S A Shah

    Annual Review of Medicine
    |January 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Individuals with the XYY genotype show increased representation in mental and penal facilities. The underlying causes for potential behavioral disabilities and associated traits require further investigation.

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    Area of Science:

    • Genetics and Human Behavior
    • Epidemiology
    • Clinical Psychology

    Background:

    • The XYY genotype is associated with a higher prevalence in specific institutional settings.
    • Existing data on XYY individuals is potentially biased due to sampling from specialized populations.
    • Physical characteristics like tallness and acne are frequently noted in association with XYY.

    Purpose of the Study:

    • To summarize epidemiological findings related to the XYY genotype.
    • To highlight the overrepresentation of XYY individuals in mental and penal settings.
    • To identify knowledge gaps regarding behavioral and personality characteristics of XYY men.

    Main Methods:

    • Review of epidemiological data concerning the XYY genotype.
    • Analysis of prevalence rates in mental health and correctional facilities.
    • Identification of commonly reported associated physical traits.

    Main Results:

    • A three- to fourfold overrepresentation of XYY individuals in mental and penal settings was observed.
    • A twentyfold overrepresentation was noted in specialized mental-penal (special security) settings.
    • Tallness and acne are frequently reported physical associations.

    Conclusions:

    • The reasons for increased risk of behavioral disability in XYY individuals remain unknown.
    • Current understanding of XYY personality and intelligence is limited by biased data.
    • Further research is needed on the broader XYY population to draw definitive conclusions.