"What makes a person physically or verbally hostile may be at least partially rooted in their genes, according to a new study.
Previous studies have established that levels of the chemical serotonin in the brain relate to aggressive behavior and lack of impulse control.
Aggression is one of the most studied aspects of human personality, and researchers say about 30%-60% of personality traits appear to have some genetic basis.
One gene that turns out to be associated with anger, aggressiveness, and impulsivity is the TPH gene, which helps regulate levels of serotonin.
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