Researchers believe that multiple genes are implicated in Major Depressive Disorder, rather than one single gene. This reflects a(n) ___________ model of inheritance.

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A polygenic model of inheritance suggests that multiple genes contribute to the development of a disorder, which is consistent with the idea that multiple genes are implicated in Major Depressive Disorder. An endophenotypic model focuses on identifying the underlying psychological and neural mechanisms that contribute to a disorder, and an epigenetic model emphasizes the role of environmental factors in gene expression. A diathesis-stress model suggests that both genetic vulnerability (diathesis) and environmental stressors contribute to the development of a disorder, but this does not specifically address the polygenic nature of Major Depressive Disorder.

Researchers Believe That Multiple Genes Are Implicated in Major Depressive