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  HcEaolqgsTnS
ۼ   Arron
йȣ   ȸ   236
  2019/07/25 (23:50)
Insert your card http://rockettube.fun/ roket tube Each human inherits 23 chromosomes from their mother and 23 from their father, equaling 46 chromosomes in each cell.  Individuals with Down syndrome inherit three (instead of two) copies of chromosome 21, which ultimately causes their â?œtrisomy 21.â?  
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