Amniocentesis is based on

Options

A. Chromosomal pattern in amniotic fluid
B. Amount of amniotic fluid
C. Composition of amniotic fluid
D. Pattern of cleavage

Answer

**Step-by-Step Solution:**

1. **Understanding Amniocentesis**: Amniocentesis is a medical procedure used during pregnancy to obtain amniotic fluid, which surrounds the fetus in the womb. This fluid contains cells shed by the fetus.

2. **Purpose of Amniocentesis**: The primary purpose of amniocentesis is to analyze the genetic material of the fetus. This analysis can help in identifying genetic disorders or chromosomal abnormalities.

3. **What is Analyzed**: During the procedure, the amniotic fluid is collected and sent to a laboratory for testing. The tests focus on the genetic composition of the fetus, particularly looking at the chromosomal patterns.

4. **Identifying the Correct Option**: Among the options provided, the one that accurately describes what amniocentesis is based on is the "chromosomal pattern in amniotic fluid." This option reflects the analysis of the genetic and chromosomal conditions of the fetus.

5. **Eliminating Incorrect Options**: The other options such as the amount of amniotic fluid, composition of amniotic fluid, and pattern of cleavage do not relate directly to the purpose of amniocentesis. Therefore, they can be ruled out.

6. **Conclusion**: The correct answer is that amniocentesis is based on the chromosomal pattern in amniotic fluid.