Possible high levels of T or fluctuating levels of S could be genetically determined. Would mean some could be more aggressive due to predisposition to biochemical differences from majority of population.
Genes can determine T levels + speed it's metabolised, + physiology of brain (how many receptors, how sensitive are receptors). Diff brain physiology (genetics) may mean pathway between limbic system + frontal cortext weak - could have effect on aggression levels.
Generally investigated using twin + adoption studies - occassionally animals.
No specific gene identified yet, but seems to be some evidence that individuals can inherit a predisposition to aggression, but genetics not a certain influence.
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