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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. 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 ]

  5. Disorders of sex development - Wikipedia

    en.wikipedia.org/wiki/Disorders_of_sex_development

    This includes patients with Turner Syndrome (45,X or 45,X0) and Klinefelter Syndrome (47,XXY) even though they do not generally present with atypical genitals. XX, Sex reversal: consist of two groups of patients with male phenotypes, the first with translocated Sex-determining region Y protein (SRY) and the second with no SRY gene.

  6. The most common birth control methods and how effective they ...

    www.aol.com/lifestyle/most-common-birth-control...

    Oral contraceptives are the second most common form of birth control in the U.S., with nearly 13% of women on birth control using it. The Pill may also help lessen period cramps and heavy bleeding ...

  7. 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]

  8. Comparison of birth control methods - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_birth...

    In the fertility awareness-based method a woman who has a predictable and consistent menstrual cycle tracks the days that she is fertile. The typical woman has approximately 9 fertile days a month and either avoids intercourse on those days or uses an alternative birth control method for that period of time. The failure rate is between 2-23%.

  9. 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 ...