study

    Cards (7)

    • aim
      How does intelligence depend on genetics?
    • method
      Twin family design
    • sample
      112 families from the Netherlands, twin registry
      23 monozygotic boy twins, 23 monozygotic girl twins, 12 Dz girls, 13 Dz boys, 20 Dz mixed gender twins
    • procedure
      Parents in child completed the ravens, progressive matrices for adults or children
    • results
      higher correlation for monozygotic twins than other family members
      Overall level of inheritance is 67%
    • conclusions
      Biology influences intelligence
    • AO2
      biological factors influence intelligence as they share genetic makeup
      Environment at home may have affected this but the correlation for Dz twins was not as strong
      They share genetics and biology, explaining why monozygotic twins correlation was higher
      Majority of influence comes from biology and genes when looking at IQ
      Siblings aged between 9 and 12 had similar results to their families
      It cannot be proven that this is due to biological factors as environment and upbringing also influence IQ.
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