(Of twins) derived from two separate ova, and so not identical.
- Twin studies have shown that the incidence of asthma is significantly higher in monozygotic twins than dizygotic twins 27-29.
- The concordance rate of obsessive-compulsive disorder is also higher for monozygotic twins than it is for dizygotic twins which suggest that there is a genetic component to this disease.
- However, these studies may have overestimated the effect of genetics if monozygotic twins share exposure to more environmental effects than dizygotic twins do.
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