Twin studies

• Twin studies


  • Identical twins (100% DNA) are more likely to commit crimes than non-identical twins (50% DNA)
• Concordance rate


  The rate at which both twins in a pair exhibit the same characteristic
• Christiansen (1977) found a 52% concordance rate for criminal behaviour between identical twins and 22% for non-identical twins
• Higher concordance rate for criminal behaviour in identical twins

  Suggests criminality has a genetic basis