Genetic Factors of Aggression

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1. What did Miles and Carey find?

  • Genetic mutation in mice caused violence in the mice
  • 50% of variation in aggressive behaviour was due to genetic influence
  • There was a significant number of adopted individuals with criminal convictions that had biological parents with criminal history
  • In a replication of Bandura's bobo doll study there was no difference in MZ and DZ aggressive behaviour
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2. Which study found that male members in a family that showed violent all had a defect MAOA gene and low levels of MAOA produced?

  • Miles and Carey
  • Caspi et al.
  • Brunner et al.
  • Plomin et al.

3. Extra Y chromosomes in males leads to...

  • Increased aggressive behaviour
  • Increased testosterone levels, which is associated with aggressive behaviour
  • Low testosterone levels which reduces aggressive behaviour

4. 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

5. Issue of Young et al.

  • Not specific enough in what gene mutates
  • Generalise with caution to humans
  • Too simplistic

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