XYY syndrome

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XYY syn·drome

a chromosomal anomaly with chromosome count 47, with a supernumerary Y chromosome; may be associated with tallness, increased physical activity, and a tendency to learning problems.

XYY syn·drome

a chromosomal anomaly with chromosome count 47, with a supernumerary Y chromosome; may be associated with tallness, increased physical activity, and a tendency to learning problems.

Klinefelter syndrome

A syndrome with a 47, XXY chromosome complement, in which the subjects are phenotypically male but have seminiferous tubule dysgenesis, elevated plasma and urinary gonadotropins, variable gynecomastia, eunuchoid habitus and possibly female secondary sex characteristics. Some patients are chromosomal mosaics, with two or more cell lines of different chromosome constitution.

XYY syndrome

YY syndrome A condition characterized by an extra Y chromosome, an array of typical clinical features–facial asymmetry, long ears, teeth and fingers, poor musculoskeletal development, cranial synostosis, prolonged P-R on EKG, and a possible tendency toward antisocial behavior

XYY syn·drome

(sin'drōm)
Aneuploidy with a supernumerary Y chromosome; associated with increased stature, aggressiveness, hyperactive behavior, mental retardation, and acne.
References in periodicals archive ?
Sperm aneuploidy and meiotic sex chromosome configurations in an infertile XYY male. Hum Reprod 2008;23:374-8.
In 1965 the British cyto-geneticist Patricia Jacobs found that a disproportionate number of men in an Edinburgh correctional institution, instead of being XY (normal) males, were XYY males. Jacobs suggested that the extra Y chromosome "predisposes its carriers to unusually aggressive behavior." Other researchers later questioned whether XYY males were more aggressive, suggesting instead that they suffered from diminished intellectual functioning that made it more likely that they would be incarcerated.
Bearn eds., 1974)("Because of the relatively small numbers, the absence of matched controls and of blind assessment procedures, and the inconsistent findings, there are relatively few psychologic, psychiatric, and behavioral characteristics which clearly and consistently distinguish the XYY males from comparable controls....
In situ hybridization chromosome analysis of XYY and XYY males' spermatozoa [Letter].
Researches studying males with an extra Y chromosome (XYY males) claimed that a genetic basis for criminality had been discovered.