1. Klinefelters syndrome
... labia, and testes instead of ovaries (barring secondary abnormalities due to chomrosomal oddities or teratogenic exposures). In someone with KS, the cause of the XXY sex chromosomes was nondysjunction [failure to separate] of the X chromosomes, either in meiosis I of the father's spermatogenesis or else at either stage of meiosis ... least, the result of the XXY constellation will be a reduction of fertility [due to a problem with spermatogenesis because of the unbalanced sex chromosome complement, as well as additional things detailed in the next section], and the majority of people w...
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- Grade Level: Undergraduate