Forenics - THEORIES OF OFFENDING - BIOLOGICAL

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Genetic Transmission

Twin studies:

  • John Lange found a much higher concordance rate for criminal tendancies for MZ twins compred to DZ twins.
  • Christiansen studied 3586 twin pairs from Danish islands and found a 35% concordance rate for male MZ twins and 13% for male DZ  twins, and 21% for female MZ twins and 8% for female DZ twins
  • dalgaard and Kringlen found in a norwegian study found 26% concordance for MZ and 15% for DZ

Evaluation

  • all concordance rates are low, suggesting environment does have some factor.
  • MZ twins may share a more similar environemnt that DZ twins as they look similar

Adoption studies

  • Crowe…

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