According to the textbook, "For bipolar disorders, heritability is about 5% to 10% for first-degree relatives and 40% to 70% for monozygotic twins compared with only 14% for fraternal twins." This statement suggests that

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The statement suggests that there is a substantial genetic component to bipolar disorders, with heritability estimates ranging from 5% to 70%. The fact that monozygotic twins (who share all of their genes) have a higher concordance rate than fraternal twins (who share only about half of their genes) indicates that genes play a significant role in the development of bipolar disorders. The environmental component may still be important, but it appears to be smaller than the genetic component.

According to the Textbook, "For Bipolar Disorders, Heritability Is About