XYY syndrome

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.