That's the view of scientists from the Karolinska Institute … Ed Gein. Boys with XYY syndrome — also known as 47,XYY — might be taller than other boys. A syndrome that is very common in the nature side of serial killers, is the XYY syndrome. Only serial killer deemed incompetent to stand trial. The similarity between mass murderers and serial killers. John Wayne Gacy, often called the "Killer Clown," was one of the worst serial killers in U.S. history, raping and murdering at least 33 young male victims. However, individuals with this syndrome have one X and two Y chromosomes. People who have the XYY syndrome can be have a greater motivation towards killing and be more sadistic (Vronsky 247). Secondly, head trauma is discussed in terms of whether it can result in aggressive and violent Sex chromosome abnormalities like XYY syndrome are some of the most common chromosome abnormalities. ... XYY karyotype syndrome is a genetic chromosomal abnormality which gives males an extra Y chromosome (Stockholm et al, 2012). Affected individuals are usually very tall. Males normally have one X and one Y chromosome. Holmes and Holmes (2010) defined a serial killer as an individual killing three or more people, while Dyer (1997) emphasized the serial nature of the killings: "Serial killers kill serially: one murder after another, each a variation and continuation of those before, each an episode in a serial" (p. 14). the XYY chromosome defense in his murder trial. Richard Benjamin Speck (December 6, 1941 – December 5, 1991) was an American mass murderer who systematically raped one and tortured and murdered eight student nurses from South Chicago Community Hospital on the night of July 13 … A serial killer will alter and refine their MO to accommodate new circumstances or to incorporate new skills and information as their criminal career progresses (Bonn, 2014). XYY syndrome is a genetic condition found in males only. (1942–1994) Person Many experience severe acne during adolescence. The purpose of this research study was to explore the existing theories which have been put forward as to what makes a serial killer. USA: Praeger Publishers. XYY syndrome is a rare chromosomal disorder that affects males. Similarly Richard Speck, who tortured, raped and murdered eight student nurses in Chicago, had an extra Y chromosome. Psychosis. XYY syndrome is a rare chromosomal disorder present at birth that affects only males. The Y chromosome is about maleness which causes more aggressive, impulsive, and violent behavior. Killers are born with a gene that makes them more likely to commit violent acts. It is caused by the presence of an extra Y chromosome. Forced Sterilization. Firstly, it shall first look into chromosomal abnormalities, specifically the condition of having an extra Y chromosome (XYY), and trying to link this with criminal behaviour. 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