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

Depression is defined as the disturbance in the mental health of a person that leads to depressed mood or loss of interest in activities and affect other life activities.

Depression is caused by the combination of both genetic and environmental factors. It means if parent or any family member have depression it is possible that it is inherited to the next generation and when a baby born, with his/her growth he/she saw depressed condition in his/her surrounding (environmental factor) which affect the mental condition of a person and get depressed.

Hence, we can say depression arises from a combination of both genetic and environmental factors.

Gene 3p25-26 is responsible for genetic depression

Explanation:

It has been found that a prevalent gene on chromosome i.e. 3p25-26 is responsible for hereditary depression  . This gene is believed to be producing recurrent depression. Thus, it is believed that nearly 40% of the depression is due to genetic reason and the remaining 60% is due to the environmental reasons.  

People having history of depression in parents or siblings , have three times high chances of  having genetic depression