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  • Twin type identical fraternal male 23 23 female 25 21 opposite sex - 20
  • The aim of the study was to separate shared genetic from shred environmental effects on intelligence.
  • Results
  • The sample was 214 families were invited to take and only 112 families responded to take part. The mean age of the twins was 9.1 years , with a mean age of siblings at 11.9 years. The mean age of biological fathers was 41.9 years compared to the mothers at 43.7 years.
  • Conclusions
  • The children were put into a room were they completed a 60 question test made of 5 sets of 12 questions and became harder as the test went on. The test covered a range of cognitive abilities for example missing puzzles.
  • •Environmental factors were found to be more important in children with genetic disposition for low IQ groups than high IQ children. •Intelligence could be inherited 67% of the time from the parents. •Spouses are more attracted to similar intelligent people.
  • 1- The influence on IQ level is genetic factors, however genes interact with the environmental factors to influence intelligence. 2- Cultural transmissions does not have significant influences on IQ. 3- Phenotypic assortment better explains spousal resemblance than social homogamy
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