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.

XYY syndrome

[eks′dob′əlwī′]
the phenotypic manifestation of an extra Y chromosome, which tends to have a positive effect on height and may have a negative effect on mental and psychological development. However, the anomaly also occurs in normal males. See also trisomy.

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 ?
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.
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.
That is to say, the percentage of prison inmates with XYY was higher than the percentage of XYY males in the general population.