American black males are twice as likely than American white males to have MAOA-L which has been linked to crime, violence and aggression in scores of studies going back over fifteen years. Black males are also 13.5 times more likely to have a rare version of the gene associated with “extreme violence and extreme aggression.” Latinos and American Indians are also nearly twice as likely as whites to have the more common version of the gene. However they are only about one fourth as likely to have the extreme version compared to blacks.
New scientific techniques have brought to light exactly how the so-called “warrior gene” named MAOA-L works. New studies using MRI show how brain activity in those who have the MAOA-L gene differs from those without it.
Studies have linked the gene to increased levels of sexual violence, alcoholism, crime, and even higher levels of credit card debt. However, very little is said about it outside of scientific journals. The reason is obvious. Many articles published on the gene even state that it has serious implications concerning race and ethnicity.
Whites, usually referred to in euphemisms like “westerners,” are said to be less likely to have the gene than other groups. One third of whites have MAOA-L, while groups usually only identified as “others” have instances of two thirds or higher. It has also been suggested in scientific journals that whites may be less affected by the gene than “others.”
In fact, researchers have even censored their own findings on race and MAOA-L! Others have faced hostility from the University community for mentioning which races have the highest rates. Source.
As usual of the PC bile, the gene in question is nicknamed "the warrior gene".
It's also known as the criminal gene, but since it is most represented amongst blacks it's given a more respectable pet name.
Naturally you're not going to see White explorers and colonists refered to as having "the conqueror gene".