Genetic explanations of OCD

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Genetic Explanation

Carrey and Gottesman (1981)- identical twins showed a concordance rate of 87% for obsessive symptoms and features, compared for 47% for fraternal twins.

Van Grootheest et al (2005)- meta analysis of twin studies- All reported higher concordance rates for mz twins than for dz twins- strong evidence for the biological approach. However, the rates for mz twins

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