Do Men Inherit More Violence Than Women? - Kathryn Paige Harden
In a Nutshell
Heritability of antisocial behavior is similar between sexes, with the same genetic factors driving aggression, substance use, and risk-taking in both men and women—though men's higher average levels amplify its real-world expression due to biological and social factors. The X chromosome plays a key role, as seen in a rare MAOA gene variant causing severe violence in affected Dutch men (e.g., rape, arson, stabbing) but sparing their sisters thanks to XX compensation. This highlights morality's biological vulnerability and suggests undiscovered X-linked genetics underlie many cases of familial violence, challenging uniform legal treatment of offenders.
These notes were generated by AI and may contain inaccuracies.
Is there a difference in heritability of antisocial behavior that's sexed? Do men inherit more? Is the heritability greater effect on boys than on girls? Generally, no. But there's one exception to come back to. The genes associated with antisocial behavior in boys also affect girls. If you're female and have a fraternal twin that's a male sibling, his antisocial behavior predicts your likelihood of manifesting it. The same genetic liabilities are reflected in the same way. The same genetic liabilities make you more likely to be physically aggressive, relationally aggressive, substance using, and risk-taking.
It's just that the mean for men, the average for men, is shifted up. The same raw materials have a greater impact in real life. The same way women attempt suicide more than men, but men commit suicide more than women. Men's ability to enact violence and antisocial stuff tends to be greater, so it's magnified.
Part of that is around social opportunity. For many years, women were discouraged from drinking and smoking, leading to big sex differences. Now, it's more socially acceptable for women to smoke and drink, and that average difference has narrowed. The same genes are involved in both.
Most current studies have focused on the autosomes (22 pairs of chromosomes the same across sexes), not the sex chromosomes (XY or XX). We're now diving into the X chromosome to see if it has specific effects on antisocial behavior. Men have one X, women have two, so men are more vulnerable to X-linked genetic variants because they lack a compensating copy.
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