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Sandberg= some males have been identified as XYY males (having an extra Y chromosome)

Analysis of 314 hospitalised XYY patients= more likely to be a result of aggressive behaviour.

Thematic apperception testing= XY, XYY, XXY men were tested. XYY were more likely to give
aggressive answers.

XYY can…

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geneBreaks down neurotransmitters in the brain (serotonin, dopamine, nor adrenaline)

Low levels= more aggression (high dopamine ect) goes against the assumption low levels of
serotonin= aggression.

Dutch family: Males were aggressive, attempted rape ect. It was identified that they had abnormally
low levels of the MAOA gene, compared to…


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