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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.
- What is XXYY Syndrome
XXYY Syndrome is the name attached to the cluster of...
- What is XXYY Syndrome
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).
XXYY Syndrome is the name attached to the cluster of symptoms that arise as a result of the 48,XXYY chromosome pattern. 48,XXYY is one of several types of sex chromosome variations, including those that are considered as variants of Klinefelter Syndrome, 47,XXY and XXXY, XXXXY, XY/XXY and another syndrome called XYY, all of which affect males.
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.
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.
1 sty 2015 · XXYY syndrome (referred to as XXYY) is a form of sex chromosome aneuploidy (SCA) originally described as the “double male,” due to the addition of an X and Y chromosome to the already complete 46, XY karyotype.
XXYY syndrome is a sex chromosome anomaly in which males have an extra X and Y chromosome. Human cells usually contain two sex chromosomes, one from the mother and one from the father. Usually, females have two X chromosomes and males have one X and one Y chromosome.
