Which of the following techniques would be used to prepare a fetal karyotype to detect trisomy 21 (Down syndrome)?

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Chorionic villus sampling (CVS) is a prenatal test that involves taking a sample of some of the placental tissue. This tissue contains the same genetic material as the fetus and can be used to prepare a fetal karyotype to detect chromosomal abnormalities such as trisomy 21 (Down syndrome). The other options listed are techniques used for analyzing DNA or genetic markers, but they are not directly used to obtain the fetal cells necessary to prepare a karyotype.

Which of the Following Techniques Would Be Used to Prepare