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Klinefelter’s syndrome is a genetic endocrine disorder that causes significant femaleness in men. It affects about one in five hundred to one in one thousand live born males. Klinefelter’s Syndrome is characterized by a lack of normal sexual development, infertility, and psychological adjustment problems. In their chromosome difference an extra “X” chromosome is present in the sex chromosome or the twenty-third chromosome. Klinefelter’s Syndrome is also known as “XXY Syndrome.” Klinefelter’s Syndrome was named after H.F. Klinefelter. He studied Klinefelter’s patients at Harvard. Klinefelter’s syndrome is caused by an extra X chromosome and affects only males. During Meiosis the 46 chromosomes separate producing two new cells with 23 chromosomes each. Before meiosis is completed the chromosomes pair with their corresponding chromosomes an