According to the findings of the minnesota study of twins reared apart, identical twins, whether raised together or apart have personalities.
slightly different
very different
slightly similar
very similar

very similar

Explanation:

In 1986 a study was done in Minnesota to determine how the personality of identical twins was influenced. In this study, after several experiments it was determined that genetics influence the personality of identical twins more than the environment. It was also found that the influence of genetics was greater than the influence of different breeding, when identical twins were created separately. The conclusion from this study was that identical twins, whether raised together or apart, have very similar personalities.

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