Narcissistic Personality Disorder is the result of a mix of genetic and environmental factors. Studies have suggested that there is 45-80% heritability, meaning that these traits are passed on from a parent to a child, supporting the genetic cause of the disorder. However it is important to remember that what is inherited is not the disorder per se, but a genetic predisposition (genotype) to developing this or any other type of mental disorder. This is where nurture comes in, because it is the environment that the person is living in that activates (or does not activate) the genotype.
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