Triple X syndrome is a form of chromosomal variation characterized by the presence of an extra X chromosome in each cell of a human female. The condition occurs only in females, which have an additional chromosome, resulting in the formation of XXX. A mosaic form also occurs where only a percentage of body cell contain XXX while the remainder carry XX. The extent to which an individual is affected by the condition will depend upon the proportion of XXX to XX throughout. The condition is also known as triplo-X, trisomy X, XXX syndrome, and 47,XXX aneuploidy. Triple X results during division of a parent's reproductive cells and occurs about once in every 1,000 female births. Unlike most other chromosomal conditions (such as Down syndrome), there is usually no distinguishable difference to the naked eye between women with triple X and the rest of the female population.
Read more about Triple X Syndrome: Cause, Symptoms, Incidence, First Case, Diagnosis
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