2.2.1.2.2 - Twin Studies

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Cards (15)

  • Blood relatives share the same genes
  • Criminal genes are believed to be able to be inherited
  • Monozygotic (MZ)

    Identical twins
  • Monozygotic twins share 100% of their DNA
  • Dizygotic twins share 50% of their DNA
  • Dizygotic
    Fraternal twins
  • Concordance rate
    Shared characteristic between two twins
  • Lange (1931): MZ twins have higher concordance rate than DZ twins
  • Lange (1913): 10 of 13 MZ twins both served time in prison
  • Lange (1913): 2 of 17 DZ twins both served time in prison
  • Christiansen studied 3,586 twins
  • Christiansen concluded that male MZ twins had a 35% concordance rate
  • Christiansen concluded that female MZ twins had a 21% concordance rate
  • Christiansen concluded that male DZ twins had a 13% concordance rate
  • Christiansen concluded that female DZ twins had a 8% concordance rate