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jordant.22 jordant.22
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Posts: 683
6 years ago
Which of the following statements regarding Down syndrome is INCORRECT?
 
  A. The affected fetus can be detected before birth by means of amniocentesis.
  B. The affected child is mentally retarded and usually has a characteristic physical appearance.
  C. Cells from an affected child reveal an extra sex chromatin body (Barr body) attached to the nuclear membrane of the cells.
  D. Chromosome karyotype of affected child usually reveals trisomy of chromosome 21.
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6 years ago
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