Twin and adoptee studies provide strong evidence for a __________ factor involved in anxiety disorders.

Question

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Twin and adoptee studies have shown that anxiety disorders often run in families, suggesting a genetic component to these conditions. These studies compare the prevalence of anxiety disorders in identical twins (who share 100% of their genes) with fraternal twins (who share about 50% of their genes), as well as with adopted individuals (who do not share genes with their adoptive family). A higher concordance rate for anxiety disorders among identical twins compared to fraternal twins or adopted individuals supports the role of genetics in the development of these disorders.

Twin and Adoptee Studies Provide Strong Evidence for a __________