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There is no known gene for aggression.  Indeed, there is no known gene for any of the common forms of human behavior (I am allowing the possibility that a genetic defect of the brain might make a person more violent, but the very fact that it is a defect means it is not a normal trait).  The science of genetics, the study of that hereditary material carried in the forty-odd chromosomes in every human cell and transmitted from one generation to the next, knows a good deal about genes for physical characteristics, very little about genes for mental ability, and virtually nothing about genes for personality traits (violence, competitiveness, kindness, surliness, a sense of humor etc).

- Howard Zinn – Declarations of Independence

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