Theilgaard : The criminal gene

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  • Created by: Emmie46
  • Created on: 29-03-15 11:46
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  • Theilgaard : The criminal gene
    • Aim
      • To if criminals had a particular gene that is responsible for their behavior
    • Procedure
      • Blood samples from over 30,000 men born in 1940's
      • 2 chromosome abnormalities -  16 had XXY and 12 had XYY
      • Interview by social worker, background, criminal history & intelligence
      • Personality test to see aggression compared to XY males
    • Results
      • XYY lower intelligence & more aggressive
      • More similarities between XXY & XYY.
      • No solid evidence for criminal gene
    • Conclusion
      • Limited evidence XYY males more aggressive than XXY
      • More similar than different
    • Strengths
      • Social worker had no knowledge of aim
      • Vast range of tests to measure different aspects
    • Weaknesses
      • Small sample
      • only 12 XYY, cannot be generalised
      • link between XXY & XYY is a correlation

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