"During her twelfth week of gestation, 38-year-old Merlia underwent a procedure in which a small sample of cells from the placenta was taken for screening. This was done to detect if the fetus had any genetic disorder. This procedure is called"

Chorionic villus sampling

Explanation:

Chorionic villus sampling can be defined as a test performed on the pregnant ladies to detect any genetic disorder.

Chorionic villus sampling (CVS) also known as Chorionic villus biopsy is a type of test performed during the first trimester of gestation in which tissue sample from the placenta is taken. This sample is taken to test any chromosomal abnormalities or genetic disorder in the fetus.

In the given case, Merlia who is a 38-year-old pregnant lady and in twelfth week of her gestation is going through CVS procedure. It is because, as stated above, a tissue sample from the placenta is taken to test any genetic disorder in the fetus.

So, the correct answer is chorionic villus sampling.

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