To understand triple X syndrome, it is necessary to know a little about genetics, specifically sex chromosomes. Females have two X chromosomes, while males have one X and one Y. Triple X is a genetic mutation that only affects females. Instead of two X chromosomes, they have three. This mutation randomly occurs during cell division in the reproductive cells of the mother, the father, or the embryo itself. Triple X is very rare and affects only about one in 1,000 live births.
Triple X syndrome is also referred to as trisomy X or XXX syndrome. One of the interesting things about this genetic mutation is that the symptoms can vary greatly from one person to the next. While some females do not have any symptoms at all, others can exhibit a wide range of abnormalities.
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