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Klinefelter syndrome is not an inherited condition. The extra X chromosome comes from the mother in approximately 50% of the cases. Maternal age is the only known risk factor. Women at 40 years have a four-times-higher risk of a child with Klinefelter syndrome than women aged 24 years. [14] [34] [35]
[1] [2] [3] Adults generally have sparse or absent facial hair. Some men have been described as having high-pitched voices. [2] Little is understood about the psychological and behavioural phenotype of XXXYY syndrome. One review described behaviour as "generally passive", a common description of people with X-chromosome polysomy. [3]
A survey of European intersex adults finding a 9.1 percent prevalence, compared to 1 percent in the general adult population. [82] This percentage differs depending on the particular intersex variation, with those with Klinefelter syndrome having the highest autism symptom prevalence of the variations measured. [82]
XYY syndrome, also known as Jacobs syndrome, is an aneuploid genetic condition in which a male has an extra Y chromosome. [1] There are usually few symptoms. [ 2 ] These may include being taller than average and an increased risk of learning disabilities .
48,XXYY syndrome is a condition related to the X and Y chromosomes (the sex chromosomes). People normally have 46 chromosomes in each cell.Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics.
Klinefelter syndrome (47,XXY and XXY syndrome) – a condition that describes a male born with at least one extra X chromosome. Though the most common variation is 47,XXY, a man may also be 48,XXXY or 49,XXXXY. It is a common occurrence, affecting 1 in 500 to 1,000 men. [44]
Nearly 90% of adults over age 20 in the U.S. are at risk of developing heart disease, an alarming new study suggests. ... Researchers identified people at high risk using a recently defined ...
Bobby Joe Long, a U.S. serial killer with Klinefelter syndrome. Ricardo López, a Uruguayan-American with Klinefelter syndrome who stalked and attempted to murder Icelandic singer Björk in 1996. Small Luk, intersex activist living in Hong Kong, founder of Beyond the Boundary – Knowing and Concerns Intersex [25]