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Foetal sex can be determined form cells ...

Foetal sex can be determined form cells presetn in amniotic fluid by looking for

A

Kinetochores

B

Chiasmata

C

Barr bodies and sex chromosomes

D

Autosomes

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The correct Answer is:
To determine the fetal sex from cells present in amniotic fluid, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Amniocentesis**: Amniocentesis is a medical procedure used to obtain a sample of amniotic fluid, which contains fetal cells. This procedure is often performed for prenatal diagnosis. 2. **Identifying the Purpose**: The primary purpose of analyzing the cells in the amniotic fluid is to determine the sex of the fetus and to check for any chromosomal abnormalities. 3. **Focusing on Chromosomes**: The sex of the fetus is determined by the presence of specific sex chromosomes. In humans, females typically have two X chromosomes (XX), while males have one X and one Y chromosome (XY). 4. **Recognizing Barr Bodies**: In females, one of the two X chromosomes becomes inactivated and forms a structure known as a Barr body. The presence of Barr bodies can indicate the presence of female sex chromosomes. 5. **Evaluating the Options**: - **Kinetochore**: This is a protein structure associated with chromosomes during cell division and is not relevant for determining fetal sex. - **Chiasmata**: This refers to the points where homologous chromosomes exchange genetic material during meiosis and does not provide information about fetal sex. - **Barr Bodies**: This is the correct option. The presence of Barr bodies indicates the presence of female sex chromosomes. - **Autosomes**: These are non-sex chromosomes and do not provide information about the sex of the fetus. 6. **Conclusion**: The fetal sex can be determined from cells present in amniotic fluid by looking for Barr bodies, which indicate the presence of female sex chromosomes. ### Final Answer: The fetal sex can be determined from cells present in amniotic fluid by looking for **Barr bodies**. ---
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