They say the gene may regulate certain hormones and blood pressure, causing stressed-out men to feel their pulses quickening and adrenaline levels surging - biological changes that trigger aggression.
By contrast, psychologists believe that women's behaviour is governed by the release of oestrogen and the so-called "cuddle hormone", oxytocin.
Dr Lee said: "The aggressive 'fight or flight' reaction is more dominant in men, while women predominantly adopt a less aggressive tend and befriend response.
"New evidence indicates that the SRY gene exerts 'maleness' by acting directly on the brain and peripheral tissues to regulate movement and blood pressure in males. We propose SRY provides a genetic basis to explain why the 'fight or flight' response is manifested mainly in males rather than females."
Researchers believe the study, published in the journal BioEssays, could lead to new treatments for personality disorders. It may also explain why conditions such as hyperactivity, autism and Parkinson's affect more men than women.
- DAILY MAIL