Word: xyy
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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...
Among 197 inmates at Carstairs State Hospital, they found no fewer than seven XYY men, or 3.5% (as well as one XXYY). This, they estimated, was 50 to 60 times the normal incidence. To check this estimate, the Edinburgh investigators examined 266 newborn boys and 209 adult men without finding a single XYY. In a random collection of 1,500 karyotypes, they found only one XYY...
...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...