Even when twin studies find that monzygotic twins have higher concordance rates than dizygotic twins, it is possible these results are not due to genetics but to the possibility that

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Monzygotic twins come from the same fertilized egg and are genetically identical, whereas dizygotic twins come from two separate fertilized eggs and share only about 50% of their genes on average. However, MZ twins are also more likely to be treated similarly throughout their lives, such as being dressed alike or being given similar names, which could account for their higher concordance rates beyond genetic factors. DZ twins may be treated differently due to their different genders or varied physical appearances.

Even When Twin Studies Find That Monzygotic Twins Have Higher