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????? 122??????????????????? ???????????? ?????47???21?Down Syndrome18??Edwards Syndrome13?Patau Syndrome21??21???????0.71.5???47XXXY,+21???????????,??,???(atd)?65?????????,???21?Down SyndromeD,GG,G?47,+21/46? ???? ??????????????4647??????????,122????9p?,???9?????????,,?????????????????????? ?????????????46???????????????????? (r)?????????????????,????5p-?? 5???????????????????????????????? ??????????????2122^????????1.??Turner??????45,X,?,1/25001/5000?????????,???? ????2.?Klinefelter Syndrome ?...

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