XYY and Testosterone Level

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XYY and Testosterone Level
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Genes

• Species A population whose offspring can
  produce fertile members

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Genetics
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XYY

• The Super Male

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XYY

• Incidence is 1 in 1000 Males
• Higher testosterone Level

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XYY Physical Appearance

• Severe Acne
• Light Weight compared to Stature
• Larger Craniofacial Areas

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Developmental

• Usually 7 Cm Taller Than Average height
• Higher Testosterone Levels

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Explaining Violent Behavior

• Theoretically increased Mental Illness

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Theory

• Higher Testosterone means higher Aggression
• Theory Advanced in 1960s to explain the behavior
  of violent males

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Taylor, 1984

• 1 to 3 higher incidence of XYY Males in Prison
  Population than General Male Population

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Holes in the Theory

• Although the Prison Population of XYY Males is
  higher, the population of XYY VIOLENT Offenders
  was lower at the time the data was taken

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Holes in the Theory

• Does NOT explain Female Violent Criminality
• Institutionalized males with Kleinfelters
  Syndrome

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Case Files
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PMS Syndrome

• 49 Females in Prison Surveyed

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PMS Syndrome

• Physical
• Emotional
• Behavioral

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Dalton

• Defense for Violent crimes

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PMS and Criminality

• DOrban and Dalton(1983)
• 156 Prisoners, half committed crimes during
  paramenstruum

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Cases

• Reid V Florida real Estate Commission (1966)
• Lavato v Irwin