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Describe and evaluate the biological approach to OCD (12 marks)

A01

Point 1 Genetic explanations
Candidate genes
o Researchers have identified genes which create vulnerability for OCD
o Some of these genes are involved in regulating the development of the
serotonin system
o E.g. some genes could be implicated in…

Page 2

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A02 Evaluation

Point 1 There is good supporting evidence

Nostadt et al (2010)
o 68% of identical twins shared OCD
o 31% of non identical twins shared OCD
Suggests genetic influence on OCD

Point 2 Too many candidate genes
Several genes are involved in OCD and each genetic variation only…

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