Sex Chromosome Genes Influence Aggression And Maternal Behavior, Say UVa Researchers

... CHARLOTTESVILLE, Va., March, 2006 â€" It has been well documented that, across human cultures and in most mammals, males are usually more aggressive and less nurturing than females. It''s simple to blame male hormones, like testosterone, for male behavior such as aggression. But maybe it''s in our genes, too... click link for more info. ...