Explain how depression arises from a combination of both genetic and environmental factors

As per epidemiological studies, a genetic factor is implicated in 30% to 40% of cases of bipolar disorder. Consequently, environmental factors play a greater role in the production of depression.

Explanation:

As per epidemiological studies, a genetic factor is implicated in 30% to 40% of cases of bipolar disorder. Consequently, environmental factors play a greater role in the production of depression. Resilience and anxiety resistance are popular; thus, though during embryonic or perinatal period certain degree of stress may be received, having genetic disposition to mental illnesses does not mean the existence of a mental disorder.

Environmental factors: psychological stress, social non-conformity, isolation and other types of reduced interaction, harassment, abandonment of close relative, or misuse of addictive drugs. These factor influence or affect you for longer period of time.

where are the vectors ?