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jdubes jdubes
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Posts: 710
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6 years ago
Which of the following causes Down syndrome?
 
  A) The presence of an extra chromosome on the 21st pair
  B) The presence of only 22 pairs of chromosomes
  C) The presence of more than 23 pairs of chromosomes
  D) The presence of an extra chromosome on the 23rd pair
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wrote...
6 years ago
A
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