Question

various procedures can be used to detect genetic disorders before birth. among the tests discussed in this chapter, which is the least invasive (list first), and which two allow the chromosomes of the fetus to be examined?

ultrasound imaging; chorionic villus sampling and amniocentesis

amniocentesis; ultrasound imaging and chorionic villus sampling

Explanation:

Ultrasound imaging is non - invasive as it uses sound waves to create an image of the fetus. Chorionic villus sampling and amniocentesis involve obtaining cells (from chorionic villi or amniotic fluid respectively) which can be used to examine the fetus' chromosomes. Amniocentesis is invasive (involves inserting a needle into the amniotic sac), so it cannot be the least invasive test.

Answer:

ultrasound imaging; chorionic villus sampling and amniocentesis