klinefelter syndrome

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Klinefelter Syndrome Joseph Tang ET 11B AP Biology

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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. - PowerPoint PPT Presentation

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Klinefelter SyndromeJoseph Tang ET 11B AP Biology

nondisjunction in meiosis

extra X chromosome(s) gamete has >1 sex chromosome zygote has >2 sex chromosomes

XXY/XXXY/XXYY etc.

Causes

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

Symptoms

aspermatogenesis karyotype: blood

sample WBCs separated chromosomal abnormalities (e.g. X chromosome)

Diagnosis

emotional problems/social pressure

decreased life expectancy (not definitive)

disease (osteoporosis, breast cancer etc.)

Prognosis

irreversible (genetic) psychosocial support cosmetic surgery to

remove breasts

Treatment

Harry Klinefelter (1942): reports about men with large breasts and little body hair

1950s: research on more symptoms

1970s: studies on newborns confirm disease

History