The high concordance rate for affective disorders in identical twins drops only slightly when they are reared apart, suggesting that ______.

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The high concordance rate for affective disorders in identical twins, even when reared apart, suggests that the most significant environmental influences likely occur during the prenatal period, as this is a time when both twins share the same environment. This implies that genetic factors play a crucial role, but the environment before birth also has a significant impact.

The High Concordance Rate for Affective Disorders in Identical Twins