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Biological explanation for anorexia nervosa (Holland et al, 1988): Evidence for a faulty gene. AIMS: to see if concordance rates for anorexia are higher in MZ twins compared to DZ twins. This would provide evidence for a faulty gene causing the disorder because if one MZ twin develops anorexia, there should be 100% concordance (agreement) with the second MZ twin also suffering from it, since they share the same genes. The rates for DZ twins should be much lower because they share only 50% same genes. PROCEDURE: * Natural experiment: because the IV (genetic relatedness) occurs naturally and cannot be changed by the investigator. Longitudonal study carried out (over time) to see if the second twin developed the disorder (the DV). * 34 pairs of twins were studied, and 1 set of triplets, chosen by opportunity sampling where one member of the twins suffered anorexia; twins were defined as MZ or DZ...

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