The fact that identical twins are often discordant with respect to mental illnesses such as schizophrenia suggests that

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The fact that identical twins, who share the same genetic makeup, can still have different outcomes with respect to mental illnesses suggests that environmental factors play a significant role in the development of these illnesses. This is supported by numerous studies on the heritability of mental illnesses such as schizophrenia, which indicate that genetic factors alone cannot fully account for the wide range of observed variations in the disorder.

The Fact That Identical Twins Are Often Discordant with Respect