What is 47XXY?
There are 23 pairs of chromosomes found in each cell of the body, and each contain genes that determine our coloring, our features, and our sex. Women inherit two X chromosomes -- one from each parent, written 46,XX. Men inherit an X chromosome from their mothers and a Y chromosome from their fathers, written 46,XY. Some individuals, however, have an additional X chromosome in their chromosomal arrangement, referred to as 47,XXY, or more commonly, just XXY. The cause is unknown, yet XXY occurs in approximately 1 in every 500 to 1000 live male births, making it one of the most common chromosome variations. The XXY variation is identified in an individual through a karyotype, a buccal smear, or FISH.
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