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Klinefelter Syndrome

Klinefelter Syndrome. Joseph Tang ET 11B AP Biology. Causes. nondisjunction in meiosis extra X chromosome(s)  gamete has >1 sex chromosome  zygote has >2 sex chromosomes XXY/XXXY/XXYY etc. Symptoms. breasts o.o lack of body hair lack of testosterone lower physical ability. Diagnosis.

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Klinefelter Syndrome

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  1. Klinefelter Syndrome Joseph Tang ET 11B AP Biology

  2. Causes nondisjunction in meiosis extra X chromosome(s)  gamete has >1 sex chromosome  zygote has >2 sex chromosomes XXY/XXXY/XXYY etc.

  3. Symptoms breasts o.o lack of body hair lack of testosterone lower physical ability

  4. Diagnosis aspermatogenesis karyotype: blood sample  WBCs separated  chromosomal abnormalities (e.g. X chromosome)

  5. Prognosis emotional problems/social pressure decreased life expectancy (not definitive) disease (osteoporosis, breast cancer etc.)

  6. Treatment irreversible (genetic) psychosocial support cosmetic surgery to remove breasts

  7. History Harry Klinefelter (1942): reports about men with large breasts and little body hair 1950s: research on more symptoms 1970s: studies on newborns  confirm disease

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