Genetic Explanations

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Twin Studies

  • Identical twins compared with Non-identical twins
  • Identical share 100% genetic makeup whereas non-identical share 50%
  • If identical twins have similar levels - genetic
  • McGuffin et al - Identical 87%, non identical 72%

Adoption Studies

  • Looking at levels of aggression between adopted children and their biological parents
  • If positive correlation is found between adoptees and bio parents

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