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  2. Klinefelter syndrome - Wikipedia

    en.wikipedia.org/wiki/Klinefelter_syndrome

    Klinefelter syndrome is not an inherited condition. The extra X chromosome comes from the mother in approximately 50% of the cases. Maternal age is the only known risk factor. Women at 40 years have a four-times-higher risk of a child with Klinefelter syndrome than women aged 24 years. [14] [34] [35]

  3. What Is Low Testosterone & What Causes It? - AOL

    www.aol.com/low-testosterone-causes-125700734.html

    Klinefelter’s syndrome occurs when a man is born with one or more extra X chromosomes, leading to a variety of impacts that include underdeveloped testicles, impaired testosterone production ...

  4. Sexual anomalies - Wikipedia

    en.wikipedia.org/wiki/Sexual_anomalies

    DSDs caused by chromosomal variation generally do not present with genital ambiguity. This includes sex chromosome DSDs such as Klinefelter syndrome, Turner syndrome and 45,X or 46,XY gonadal dysgenesis. [13] Males with Klinefelter syndrome usually have a karyotype of 47,XXY as a result of having two or more X chromosomes. [14]

  5. Noninvasive prenatal testing - Wikipedia

    en.wikipedia.org/wiki/Noninvasive_prenatal_testing

    Noninvasive prenatal testing (NIPT) is a method used to determine the risk for the fetus being born with certain chromosomal abnormalities, such as trisomy 21, trisomy 18 and trisomy 13. [ 1 ] [ 2 ] [ 3 ] This testing analyzes small DNA fragments that circulate in the blood of a pregnant woman. [ 4 ]

  6. Nondisjunction - Wikipedia

    en.wikipedia.org/wiki/Nondisjunction

    Klinefelter syndrome is the most common sex chromosome aneuploidy in humans. It represents the most frequent cause of hypogonadism and infertility in men. Most cases are caused by nondisjunction errors in paternal meiosis I. [2] About eighty percent of individuals with this syndrome have one extra X chromosome resulting in the karyotype XXY ...

  7. Why are there so few male birth-control options?

    www.aol.com/lifestyle/why-few-male-birth-control...

    A 2021 review of multiple studies looking at attitudes toward new male birth control options found that “there is consistent interest among both men and women” and a “willingness to use them ...

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