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XXYY syndrome occurs in approximately 1:18,000–1:40,000 males. Although the physical phenotype is similar to 47,XXY (tall stature, hypergonadotropic hypogonadism, and infer-tility), XXYY is associated with additional medical problems and more significant neurodevelopmental and psychological features.
XXYY syndrome is a sex chromosome anomaly in which males have two extra chromosomes, one X and one Y chromosome. Human cells usually contain two sex chromosomes, one from the mother and one from the father. Usually, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY).
14 maj 2008 · We report on the results of a cross-sectional, multi-center study of 95 males age 1–55 with XXYY syndrome (mean age 14.9 years), describing diagnosis, physical features, medical problems, medications, and psychological features stratified by age groups.
48,XXYY syndrome results from nondisjunction events of sex chromosomes primarily during spermatogenesis (meiosis I and/or meiosis II) or less often from post-zygotic mitotic nondisjunction during cell division.
How to identify XXYY Compressed Photos. The XXYY Project connects parents, medical professionals, and service providers to guide males living with XXYY Syndrome through social, physical and emotional challenges.
XXYY syndrome is the result of having extra copies of both the X and Y chromosomes, occurring when a normal female oozyte (X m) is fertilized with an aneuploidy sperm (X p Y p Y p) produced from double nondisjunction during meiosis.
22 kwi 2024 · Trisomy conditions, including Klinefelter syndrome (47, XXY), Jacob syndrome (47, XYY), and Trisomy X (47, XXX), are the most common, but tetrasomy or pentasomy conditions also occur (e.g., 48, XXYY) [3, 4].
