Klinefelter's syndrome, 47, XXY, or XXY syndrome is a condition in which human males have an extra (an aneuploidy) X sex chromosome. While females have an XX chromosomal makeup, and males an XY, affected individuals have at least two X chromosomes and at least one Y chromosome. Because of the extra chromosome, individuals with the condition are usually referred to as "XXY Males", or "47, XXY Males".Read more on Wikipedia
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