The most common form of fetal testing is __________.

• A. amniocentesis
• B. imprinting
• C. chorionic villi sampling
• D. gene therapy

Answer: (A)

Verified step by step guidance

1. Begin by understanding the context of fetal testing, which is used to assess the health and development of a fetus during pregnancy.
2. Identify the different types of fetal testing methods mentioned: amniocentesis, imprinting, chorionic villi sampling, and gene therapy.
3. Amniocentesis involves extracting a small amount of amniotic fluid from the sac surrounding the fetus to test for genetic conditions and chromosomal abnormalities.
4. Chorionic villi sampling (CVS) is another method where a sample of placental tissue is taken to test for genetic disorders, usually performed earlier in pregnancy than amniocentesis.
5. Gene therapy is not typically used as a form of fetal testing; it is a treatment method aimed at correcting genetic disorders by introducing or altering genetic material.