Psychologists who argue for the importance of biological factors in mental disorders use which of the following kinds of evidence to support this approach?

Question

Quizplus · Accepted Answer

Studies of the rates of mental disorders in fraternal versus identical twins provide evidence for the importance of biological factors in mental disorders because identical twins share 100% of their genes, while fraternal twins share only 50% of their genes. If mental disorders were solely due to environmental factors, then we would expect to see no difference in the rates of mental disorders between identical and fraternal twins. However, studies have shown that identical twins are more likely to develop mental disorders than fraternal twins, suggesting that genes play a role in the development of mental disorders.

Psychologists Who Argue for the Importance of Biological Factors in Mental