Genetic Factors of Aggression

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1. Which study found that meta-analysis of 51 twin and adoption studies found that aggressive behaviour was a result of genetic influence?

  • Cocarro et al.
  • Rhee and Waldman
  • Young et al.
  • Hutchings and Mednick
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2. Theilgaard's initial research found?

  • Inmates with an extra Y chromosome had increased aggressive thought patterns and decreased non-aggresive thought patterns
  • Male members in a family that showed violent all had a defect MAOA gene and low levels of MAOA produced
  • Only difference in males with an extra Y chromosome and their normal counterparts was height
  • There was a significant number of adopted individuals with criminal convictions that had biological parents with criminal history

3. What did Plomin et al find?

  • There was a significant number of adopted individuals with criminal convictions that had biological parents with criminal history
  • 50% variance in aggressive behaviour was due to genetic influence
  • In a replication of Bandura's bobo doll study there was no difference in MZ and DZ aggressive behaviour
  • Genetic mutation in mice causes violence

4. Which study found that children with variant of the MAOA gene, produced less of MAOA but only showed aggressive behaviour if maltreated during childhood?

  • Caspi et al.
  • Plomin et al.
  • Young et al.
  • Brunner et al.
  • Theilgaard

5. What did Miles and Carey find?

  • 50% of variation in aggressive behaviour was due to genetic influence
  • In a replication of Bandura's bobo doll study there was no difference in MZ and DZ aggressive behaviour
  • There was a significant number of adopted individuals with criminal convictions that had biological parents with criminal history
  • Genetic mutation in mice caused violence in the mice
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