History Main / ExtraYExtraViolent

* In ''Literature/Soul'', by Tobsha Learner, a character searches for an explanation as to why some men are predisposed to violence and murder. She considers that an extra Y chromosome may be involved, but this explanation doesn't pan out.

* In ''Soul'', by Tobsha Learner, a character searches for an explanation as to why some men are predisposed to violence and murder. She considers that an extra Y chromosome may be involved, but this explanation doesn't pan out.

* The ''Series/{{Charmed}}'' fanfic, ''The Ultimate Demon'', features a character that has an extra Y chromosome. According to Memphis, another character, not only are XYY men prone to violent behavior but the 47,XYY karyotype may be due to demons and humans mating in the distant past.

* In "Sam, Soren and Ed," a short story by Guy Vanderhaeghe, Ed describes another character, whom he first sees aggressively practising martial arts, as an “extra-Y-chromosome type.” After a confrontation with his estranged wife, Ed almost has to fight the man, but the police show up and diffuse the situation.

* [[InsaneTrollLogic Therefore, an extra extra Y chromosome makes you even]] ''[[InsaneTrollLogic more]]'' [[InsaneTrollLogic aggressive and violent.]]

Men with an extra Y chromosome is a pretty common genetic disorder (1 out of 1,000 biologically male humans), also known as Jacobs' syndrome that, at its worst, has only two symptoms: above-average height and an increased susceptibility to learning disorders.

* Therefore, an extra Y chromosome makes you ''more'' male.

* Serial killer Richard Speck was widely (and incorrectly) reported to be XYY, which popularized this trope.

* An episode of ''ForeverKnight'' centers on a legend that a (female) vampire who mated with an XYY male "higher than high, under the light of the full moon" would become human. The XYY human did have extra violent tendencies.

* In one episode of ''{{Series/Doomwatch}}'', “By the Pricking of My Thumbs…”, a teenager faces discrimination because he is XYY. The episode features a scientist who is convinced that having the extra Y chromosome predisposes a person to criminal behavior, but this position is meant to be seen as misguided.

Men with an extra Y chromosome is a pretty common genetic disorder (1 out of 1,000 biologically male humans) that, at its worst, has only two symptoms: above-average height and an increased susceptibility to learning disorders.

* [[InsaneTrollLogic Therefore, an extra extra Y chromosome makes you even ''more'' aggressive and violent.]]

* The Season 5 finale episode "Born to Kill" of ''CSIMiami'' referenced this trope. A couple knew that their son had this condition and constantly treated him with suspicion because of it. [[spoiler:When their daughter accidentally kills their other daughter by pushing her down the stairs, she claimed ''he'' did it on purpose; this is what actually turned him violent.]]

* [[InsaneTrollLogic Therefore, an extra extra Y chromosome makes you even]] ''[[InsaneTrollLogic more]]'' [[InsaneTrollLogic aggressive and violent.]]

* In ''Full Cry'', by Rita Mae Brown, two characters discuss criminals, with one claiming many criminals were “born bad,” giving as an example that most men who are born XYY can’t control their violent behaviour.

** Generally speaking, prison populations have considerable concentrations of people with significantly low IQ, for whatever reason.

* In ''Hybrids'', by Robert J. Sawyer, the link between an extra Y chromosome and a predisposition to violent behaviour is mentioned. A character even suspects another character of being XYY based on his physical appearance and personality.

* Interestingly, in ''Middlesex'', by Jeffrey Eugenides, XYY boys are referred to as "dreamers and loners," rather than the common stereotype.

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* In ''Night Vision'', by Paul Levine, several characters discuss psychopathic killers. Pamela Maxson explains she studies both environmental and biological components, including possessing an extra Y chromosome, which might explain the behaviour of psychopaths. She claims that the XYY karyotype is four times more prevalent among murderers.


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* In ''Night Vision'', by Paul Levine, several characters discuss psychopathic killers. Pamela Maxson explains she studies both environmental and biological components, including possessing an extra Y chromosome, which might explain the behaviour of psychopaths. She claims that the XYY karyotype is four times more prevalent among murderers.

* The ''Series/{{Charmed}}'' fanfic, ''The Ultimate Demon'', features a character that has an extra Y chromosome. According to Memphis, another character, not only are XYY men prone to violent behavior but the XYY genotype may be due to demons and humans mating in the distant past.

* In ''Babel Fish'', an [[XMen X-Men]] fanfic, a character is revealed to have an extra Y chromosome. Beast explains that this may be responsible for lankiness and lower IQ, but states that the notion that XYY males are prone to becoming serial killers is nonsense.