Do Serial Killers Have an Extra Chromosome?
Multiple murderer Bobby Joe Long had an extra X (female) chromosome, otherwise known as Klinefelter’s syndrome, which meant he had the female hormone estrogen circulating in higher amounts in his system. His breasts grew during puberty, which caused him great embarrassment. Long, however, has an abundance of other serial killer prerequisites. He suffered traumatic and repeated head injuries, among other things. Richard Speck Conversely, an extra Y (male) chromosome was once in vogue as an explanation to violence. Mass murderer Richard Speck’s legal defense said he had an XYY genetic makeup, but further tests proved this wrong. While an extra male chromosome seems like a logical explanation for mutant-aggressive behavior, there is not much evidence that links the X or Y chromosome to serial killers. Testosterone High testosterone in itself is not a dangerous thing, but when it is combined with low levels of serotonin, the results might be deadly. Testosterone is associated with the need
