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[[AC:{{Fanfic}}]]
* 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.
* 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.
* 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.
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* In "Born Bad", an episode of ''Series/LawAndOrder'', a lawyer argues that his client should not be found guilty since his extra Y chromosome predisposes him to be violent. [[spoiler: It [[GoneHorriblyRight went horribly right]], the client bought the arguement so much that he begged to be jailed for life. He was a teen.]]
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* In "Born Bad", an episode of ''Series/LawAndOrder'', a lawyer argues that his client should not be found guilty since his extra Y chromosome predisposes him to be violent. [[spoiler: It [[GoneHorriblyRight went horribly right]], the client bought the arguement argument so much that he begged to be jailed for life. He was a teen.]]
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* In ''Vickers'', by Mick Farren, a big muscular character who seems to like violence is referred to as "an Australian surfer with an extra Y chromosome."
* Interestingly, in ''Middlesex'', by Jeffrey Eugenides, XYY boys are referred to as "dreamers and loners," rather than the common stereotype.
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* [[InsaneTrollLogic Therefore, an extra Y chromosome makes you even]] ''[[InsaneTrollLogic more]]'' [[InsaneTrollLogic aggressive and violent.]]
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* [[InsaneTrollLogic Therefore, an extra extra Y chromosome makes you even]] ''[[InsaneTrollLogic more]]'' [[InsaneTrollLogic aggressive and violent.]]
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* In ''Transfiguration'', by Paul Weber, a doctor mentions this trope while discussing Apollonia's strange chromosomal abnormalities. The doctor states that people used to think XYY males had a higher rate of criminality but admits this has been shown to be false.
* This trope plays a role in ''Gone to Earth'', by Rick Boyer. Interestingly, the novel discusses not only the idea that XYY men have a propensity for crime and aggression but also mentions other features including having acne, prominent facial hair, lower intelligence and psychological issues as well as being taller and stronger.
* In ''The Labyrinth Key'', by Howard V. Hendrix, a character explains that society has always searched for a biological way of detecting future deviant behavior, and includes the XYY studies as an example.
* In ''Midnight Admirals'', by Douglas Muir, two characters discuss a killer and one explains the criminal can’t be XYY because he doesn’t display low intelligence.
* In ''Good News, Bad News'', by David Wolstencroft, a character refers to Latham as “XYY” and ponders how men were the cause of most wars and are blamed for almost all the violence in the world.
* This trope plays a role in ''Gone to Earth'', by Rick Boyer. Interestingly, the novel discusses not only the idea that XYY men have a propensity for crime and aggression but also mentions other features including having acne, prominent facial hair, lower intelligence and psychological issues as well as being taller and stronger.
* In ''The Labyrinth Key'', by Howard V. Hendrix, a character explains that society has always searched for a biological way of detecting future deviant behavior, and includes the XYY studies as an example.
* In ''Midnight Admirals'', by Douglas Muir, two characters discuss a killer and one explains the criminal can’t be XYY because he doesn’t display low intelligence.
* In ''Good News, Bad News'', by David Wolstencroft, a character refers to Latham as “XYY” and ponders how men were the cause of most wars and are blamed for almost all the violence in the world.
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* At one point in ''Other Men’s Daughters'', by Richard Stern, several social issues and controversies are mentioned, including the "social peril of the XYY male with criminal valence in his cells."
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* At one point in ''Other Men’s Daughters'', by Richard Stern, several social issues and controversies are mentioned, including the "social peril of the XYY male with the criminal valence in his cells."
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* At one point in ''Other Men’s Daughters'', by Richard Stern, several social issues and controversies are mentioned, including the "social peril of the XYY male with criminal valence in his cells."
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* In ''Seduction'', by Catherine Gildiner, a character believes there are many XYY men in prison, whom she describes as violent and possessing low intelligence.
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* In ''Slow Motion Riot'', by Peter Blauner, Andrea refers to a character who seems to "love to do crimes" as acting like someone with an extra Y chromosome.
* This trope plays an important role in ''The Campus Detective: The Sociopath'', by Dave Larson.
* ''The Stranger in Goldrush'', by Sheila Bush, mentions this trope. A character briefly refers to "macho psychopaths" with extra Y chromosomes.
* The connection between criminal violence and an extra Y chromosome is touched upon by a character in ''Child of My Right Hand'', by Eric K. Goodman, as he thinks about genetic predispositions.
* This trope plays an important role in ''The Campus Detective: The Sociopath'', by Dave Larson.
* ''The Stranger in Goldrush'', by Sheila Bush, mentions this trope. A character briefly refers to "macho psychopaths" with extra Y chromosomes.
* The connection between criminal violence and an extra Y chromosome is touched upon by a character in ''Child of My Right Hand'', by Eric K. Goodman, as he thinks about genetic predispositions.
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* 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.
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* The short poem, "It's Easy As XYY", refers to this trope, linking an extra Y chromosome to violence.
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* In a 1993 episode of the TalkShow, ''The Phil Donahue Show'', a psychiatrist discusses a patient he believes committed murder due to having an extra Y chromosome.
[[AC:{{Newspaper Comics}}]]
* In a Nick Downes cartoon, a tough cowboy is known for "his fast gun, mean temper, and extra Y chromosome."
[[AC:{{Newspaper Comics}}]]
* In a Nick Downes cartoon, a tough cowboy is known for "his fast gun, mean temper, and extra Y chromosome."
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** Generally speaking, prison populations have considerable concentrations of people with significantly low IQ, for whatever reason.
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* In "Born Bad", an episode of ''Series/LawAndOrder'', a lawyer argues that his client should not be found guilty since his extra Y chromosome predisposes him to be violent. [[spoiler: It GoesHorriblyRight, the client bought the arguement so much that he begged to be jailed for life. He was a teen.]]
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* In "Born Bad", an episode of ''Series/LawAndOrder'', a lawyer argues that his client should not be found guilty since his extra Y chromosome predisposes him to be violent. [[spoiler: It GoesHorriblyRight, [[GoneHorriblyRight went horribly right]], the client bought the arguement so much that he begged to be jailed for life. He was a teen.]]
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* In "Born Bad", an episode of ''Series/LawAndOrder'', a lawyer argues that his client should not be found guilty since his extra Y chromosome predisposes him to be violent.
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* In "Born Bad", an episode of ''Series/LawAndOrder'', a lawyer argues that his client should not be found guilty since his extra Y chromosome predisposes him to be violent.
violent. [[spoiler: It GoesHorriblyRight, the client bought the arguement so much that he begged to be jailed for life. He was a teen.]]
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* In ''Missing Pieces'', a novel by Joy Fielding, a character is asked what causes someone to become a violent sociopath. He responds that there is no consensus as to whether it is more nature or nurture and cautions that attributing such behaviour to an extra Y chromosome is problematic.
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[[AC:{{Comic Books}}]]
* Deadfall, from ''Artemis: Requiem'', was artificially given an extra Y chromosome. His powers include super strength and the ability to manipulate testosterone. He is described as perhaps the most aggressive male on earth.
* Deadfall, from ''Artemis: Requiem'', was artificially given an extra Y chromosome. His powers include super strength and the ability to manipulate testosterone. He is described as perhaps the most aggressive male on earth.
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* This trope is mentioned in ''Nightlines'', a novel by John Lutz.
* Mentioned in ''Succulent Prey'', by Wrath James White, in which a character states that the link between an extra Y chromosome and serial killers has been shown to be false.
* 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.
* Mentioned in ''Succulent Prey'', by Wrath James White, in which a character states that the link between an extra Y chromosome and serial killers has been shown to be false.
* 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.
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* ''Film/{{Alien 3}}''. All the XYY males are automatically put on a penal colony.
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* ''Film/{{Alien 3}}''. All the XYY males are automatically put on a prisoners at the penal colony.colony are XYY males. Interestingly, the prison was actually shut down and these were the prisoners who elected to stay. Many of them claim to be trying to change as well.
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* Used in ''{{Alien}}''. All the XYY males are automatically put on a penal colony.
* Referenced in ''ScaryMovie 3''.
* Referenced in ''ScaryMovie 3''.
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* Used in ''{{Alien}}''.''Film/{{Alien 3}}''. All the XYY males are automatically put on a penal colony.
* Referenced in''ScaryMovie ''Film/ScaryMovie 3''.
* Referenced in
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This trope is based on a couple of widely-reported studies from the 60's which didn't pan out on further research (see the RealLife section). Media, however, didn't get the memo.
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This trope is based on a couple of widely-reported studies from the 60's 1960s which didn't pan out on further research (see the RealLife section). Media, however, didn't get the memo.
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* In "Born Bad", an episode of ''Series/LawAndOrder'', a lawyer argues that his client should not be found guilty since his extra Y chromosome predisposes him to be violent.
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* 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.
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* Played utterly straight in the ''StarTrek'' short story "The Procrustean Petard": the ''Enterprise'' crew is gender-flipped by an alien device which doesn't know how to deal with HalfHumanHybrid Mr. Spock, so it makes him XYY instead.
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* Played utterly straight in the ''StarTrek'' ''Franchise/StarTrek'' short story "The Procrustean Petard": the ''Enterprise'' crew is gender-flipped by an alien device which doesn't know how to deal with HalfHumanHybrid Mr. Spock, so it makes him XYY instead.
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* The biology research institute in ''TheCatONineTails'' is researching it while the murders happen around it.
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* The biology research institute in ''TheCatONineTails'' ''Film/TheCatONineTails'' is researching it while the murders happen around it.
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* Played with in ''CriminalMinds'', where a killer claims that he's XYY, and that's why he kills. However, Rossi replies that the study linking that condition to criminal behaviour was debunked years ago.
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* Played with in ''CriminalMinds'', ''Series/CriminalMinds'', where a killer claims that he's XYY, and that's why he kills. However, Rossi replies that the study linking that condition to criminal behaviour was debunked years ago.
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Point out the trope origin, remove pothole to Artistic License Statistics because false correlations are not necessarily in bad faith, especially with small samples
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An extra Y chromosome. A common enough 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.
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This trope is based on a couple of widely-reported studies from the 60's which didn't pan out on further research (see the RealLife section). Media, however, didn't get the memo.
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* Richard Speck falsely claimed that he was XYY and that it was why he killed all those women.
* The source of this idea was some medical studies from the 1960s, which claimed that the XYY genotype actually could cause a propensity for violent behaviour. This came from a study that revealed a slightly higher incidence of XYY among jailed convicts than among the general population. Which was either a coincidence, or a [[ArtisticLicenseStatistics false correlation]], that didn't account for how XYY men (like people with other chromosomal abnormalities) have an increased risk of learning disabilities that might hinder their ability to ''get away'' with a crime. Though this idea has been discredited, it still pops up now and then.
* The source of this idea was some medical studies from the 1960s, which claimed that the XYY genotype actually could cause a propensity for violent behaviour. This came from a study that revealed a slightly higher incidence of XYY among jailed convicts than among the general population. Which was either a coincidence, or a [[ArtisticLicenseStatistics false correlation]], that didn't account for how XYY men (like people with other chromosomal abnormalities) have an increased risk of learning disabilities that might hinder their ability to ''get away'' with a crime. Though this idea has been discredited, it still pops up now and then.
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* Serial killer Richard Speck falsely claimed that he was XYY and that it was why he killed all those women.
widely (and incorrectly) reported to be XYY, which popularized this trope.
* The source of this idea was [[http://en.wikipedia.org/wiki/Xyy#History some medical studies from the1960s, 1960s]], which claimed that the XYY genotype actually could cause a propensity for violent behaviour. This came from a study The studies found that revealed male prison inmates who were unusually tall had a slightly higher incidence of XYY among jailed convicts than among the general population. Which was either a coincidence, or a [[ArtisticLicenseStatistics false correlation]], correlation that didn't properly account for a) how XYY men (like people with other chromosomal abnormalities) have an increased risk of learning disabilities that might hinder their ability to ''get away'' with a crime.crime and b) selecting for height in itself increases the chance of finding XYY carriers. Though this idea has been discredited, it still pops up now and then.
* The source of this idea was [[http://en.wikipedia.org/wiki/Xyy#History some medical studies from the
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* Played utterly straight in the ''StarTrek'' short story "The Procrustean Petard": the ''Enterprise'' crew is gender-flipped by an alien device which doesn't know how to deal with HalfHumanHybrid Mr. Spock, so it makes him XYY instead.
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An extra Y chromosome. A common enough 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.
In fiction, however, being XYY makes you a criminal! It's simple logic:
* A Y chromosome makes you male.
* Therefore, an extra Y chromosome makes you ''more'' male.
* Men are more aggressive and violent.
* [[InsaneTrollLogic Therefore, an extra Y chromosome makes you even]] ''[[InsaneTrollLogic more]]'' [[InsaneTrollLogic aggressive and violent.]]
This trope is likely to show up in crime dramas and other works that involve both bad guys and genetics researchers or genetic typing. It's usually either the reason the bad guy is bad or an aggravating factor in his badness.
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!!Examples
[[AC:{{Film}}]]
* Used in ''{{Alien}}''. All the XYY males are automatically put on a penal colony.
* Referenced in ''ScaryMovie 3''.
* The biology research institute in ''TheCatONineTails'' is researching it while the murders happen around it.
[[AC:{{Literature}}]]
* ''[[http://en.wikipedia.org/wiki/The_XYY_Man The XYY Man]]'' began life as a series of novels by Kenneth Royce, featuring the character of William (or Willie) 'Spider' Scott, a one-time cat-burglar who leaves prison aiming to go straight but finds his talents still to be very much in demand by both the criminal underworld and the British secret service. Scott has an extra "y" chromosome that supposedly gives him a criminal predisposition - although he tries to go straight, he is genetically incapable of doing so.
[[AC:LiveActionTV]]
* 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.]]
* Played with in ''CriminalMinds'', where a killer claims that he's XYY, and that's why he kills. However, Rossi replies that the study linking that condition to criminal behaviour was debunked years ago.
* 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.
* ''[[http://www.imdb.com/title/tt0075601/ The XYY Man]]'', the first of Kenneth Royce's novels, was transferred to British television by Granada TV, in a three-part adaptation with Stephen Yardley playing Scott. The adventures of Scott caught the public imagination and ten more episodes followed in 1977.
[[AC:RealLife]]
* Richard Speck falsely claimed that he was XYY and that it was why he killed all those women.
* The source of this idea was some medical studies from the 1960s, which claimed that the XYY genotype actually could cause a propensity for violent behaviour. This came from a study that revealed a slightly higher incidence of XYY among jailed convicts than among the general population. Which was either a coincidence, or a [[ArtisticLicenseStatistics false correlation]], that didn't account for how XYY men (like people with other chromosomal abnormalities) have an increased risk of learning disabilities that might hinder their ability to ''get away'' with a crime. Though this idea has been discredited, it still pops up now and then.
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In fiction, however, being XYY makes you a criminal! It's simple logic:
* A Y chromosome makes you male.
* Therefore, an extra Y chromosome makes you ''more'' male.
* Men are more aggressive and violent.
* [[InsaneTrollLogic Therefore, an extra Y chromosome makes you even]] ''[[InsaneTrollLogic more]]'' [[InsaneTrollLogic aggressive and violent.]]
This trope is likely to show up in crime dramas and other works that involve both bad guys and genetics researchers or genetic typing. It's usually either the reason the bad guy is bad or an aggravating factor in his badness.
----
!!Examples
[[AC:{{Film}}]]
* Used in ''{{Alien}}''. All the XYY males are automatically put on a penal colony.
* Referenced in ''ScaryMovie 3''.
* The biology research institute in ''TheCatONineTails'' is researching it while the murders happen around it.
[[AC:{{Literature}}]]
* ''[[http://en.wikipedia.org/wiki/The_XYY_Man The XYY Man]]'' began life as a series of novels by Kenneth Royce, featuring the character of William (or Willie) 'Spider' Scott, a one-time cat-burglar who leaves prison aiming to go straight but finds his talents still to be very much in demand by both the criminal underworld and the British secret service. Scott has an extra "y" chromosome that supposedly gives him a criminal predisposition - although he tries to go straight, he is genetically incapable of doing so.
[[AC:LiveActionTV]]
* 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.]]
* Played with in ''CriminalMinds'', where a killer claims that he's XYY, and that's why he kills. However, Rossi replies that the study linking that condition to criminal behaviour was debunked years ago.
* 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.
* ''[[http://www.imdb.com/title/tt0075601/ The XYY Man]]'', the first of Kenneth Royce's novels, was transferred to British television by Granada TV, in a three-part adaptation with Stephen Yardley playing Scott. The adventures of Scott caught the public imagination and ten more episodes followed in 1977.
[[AC:RealLife]]
* Richard Speck falsely claimed that he was XYY and that it was why he killed all those women.
* The source of this idea was some medical studies from the 1960s, which claimed that the XYY genotype actually could cause a propensity for violent behaviour. This came from a study that revealed a slightly higher incidence of XYY among jailed convicts than among the general population. Which was either a coincidence, or a [[ArtisticLicenseStatistics false correlation]], that didn't account for how XYY men (like people with other chromosomal abnormalities) have an increased risk of learning disabilities that might hinder their ability to ''get away'' with a crime. Though this idea has been discredited, it still pops up now and then.
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