Question: Describe the evidence that a fetus has trisomy 21 that each of the following procedures or technologies provides: a. amniocentesisn b. chorionic villus samplingn c.

Describe the evidence that a fetus has trisomy 21 that each of the following procedures or technologies provides:

a. amniocentesisn
b. chorionic villus samplingn
c. maternal serum markersn
d. cell-free fetal DNA

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