To identify genes that put people at risk for depression, researchers have used

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Linkage analysis is a technique used in genetics to discover the location of a disease-causing gene on a chromosome. By analyzing the patterns of inheritance of genetic markers in families affected by a disease, researchers can identify regions of the genome that are associated with increased risk for that disease. This approach has been used to identify genes associated with depression and other mental health disorders. The other options listed (fMRI scans, PET scans, and the DSM-IV-TR) are all tools used in the diagnosis and study of depression, but they do not directly identify specific genetic risk factors.

To Identify Genes That Put People at Risk for Depression