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Nine of the patients, ranging from 5 ft 7 in (1.70 m) to 6 ft 2 in (1.88 m) height, were found to have an extra Y chromosome, the XYY syndrome. [20] [21] [22] Jacobs hypothesized that men with XYY syndrome are more prone to aggressive and violent behavior than males with the normal XY karyotype, but the idea was later shown to be incorrect.
XYY syndrome, also known as Jacobs syndrome, is an aneuploid genetic condition in which a male has an extra Y chromosome. [1] There are usually few symptoms. [2] These may include being taller than average and an increased risk of learning disabilities. [1] [2] The person is generally otherwise normal, including typical rates of fertility. [1]
This is an accepted version of this page This is the latest accepted revision, reviewed on 12 February 2025. A serial killer is typically a person who kills three or more people, with the murders taking place over more than a month and including a significant period of time between them. The Federal Bureau of Investigation (FBI) defines serial murder as "a series of two or more murders ...
The serial killer's murder spree came to an end in 1994 when his 13-year-old son found a human skull and a pile of bones in the woods around Fox Hollow Farm. AP Photo/Darron Cummings; Hamilton ...
Here are 10 infamous serial killers who eluded justice. As riveting as it is to follow the twisted narratives of serial murderers on screen, many killers have never been caught in real life. Here ...
Gary Allen Srery (July 26, 1942 – April 27, 2011) was an American rapist and serial killer who was responsible for murdering at least four women in Calgary, Alberta. [3] Each victim was between the ages of 14 and 20 and were killed between February 1976 and February 1977, but the cases were only grouped together in 2021 through DNA evidence. [2]
The victims were found in vacant lots with their throats slit. One of the victims is unidentified. Mario Alberto Berrios Muñoz, a serial killer murdered in 2023, is the main suspect. [100] Little Rock serial stabbings United States 2020–2021 3 3 The fatal stabbings of three people in Little Rock, Arkansas. [101] Janikhel grave Pakistan: 2020 4 4
Alfred J. Gaynor (born December 10, 1966) is an American serial killer and rapist who committed a series of nine murders in the city of Springfield, Massachusetts from 1995 to 1998. For these crimes, Gaynor was subsequently given four sentences of life imprisonment without parole.