Twin studies have shown that:

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Twin studies have shown that a higher concordance rate for a disorder in identical twins compared to fraternal twins provides strong evidence for a genetic basis of the disorder. However, the exact magnitude of the genetic contribution may vary depending on the disorder being studied. While concordance rates for medical disorders may be higher than for psychological disorders, this is not necessarily always the case. Similarly, there is actually strong evidence that autism has a genetic basis, with twin studies showing concordance rates of 60-90% in identical twins compared to 0-10% in fraternal twins.

Twin Studies Have Shown That