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1. what did meta analysis of 14 twin studies find

  • 10 times as likely to develop ocd if twin has it
  • monozygotic twins were twice as likely to have ocd if their twin has it
  • that there was no correlation
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2. name 3 behaviours that result as evolutionary adaptations

  • grooming, concern for others, hoarding
  • cleaning, tidying, hoarding
  • brushing, dancing, stuttering

3. which researcher was the psychodynamic approach based upon?

  • Freud
  • bandura
  • johnson

4. name an alternative gene to the COMT gene and what it showed?

  • the SAPAP3 gene which showed and increase in grooming with mice
  • the SAPAP gene showing a decrease in mice grooming themselves

5. what concordance rates were found between twins with OCD?

  • 40% concordance rates
  • 87% concordance between MZ twins only 13% environmental
  • 96% DZ twins with only 4% environmental


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