Word: xyy
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Dates: during 1960-1969
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This has been recognized since 1959. Despite the factor of low intelligence, it has not been linked with criminality. If the extra chromosome is a Y, the baby gets an XYY pattern and is unquestionably male. Or, as evidence gathered by an all-woman team of researchers in Scotland now suggests, he may be a supermale, overaggressive and potentially criminal. Dr. Patricia A. Jacobs and her colleagues working at Western General Hospital in Edinburgh knew that a number of mentally defective men with a double dose of both sex chromosomes, or XXYY, had been found in Swedish and English institutions...
...normal man has one x, but his y chromosome is decisive and establishes maleness. A fairly common case of "one chromosome too many" is an xxy combination, but this is accompanied by external male genitalia and poor, nonathletic physical development. More probably, Ewa is a mosaic, with some xyy cells, and others containing a single x and nothing else...