Barr body is associated with

Options

A. Autosome
B. X-chromosome
C. Y-chromosome
D. Male sex only

Answer

**Step-by-Step Solution:**

1. **Understanding Barr Bodies**: A Barr body is an inactivated X chromosome found in female somatic cells. In females, who have two X chromosomes (XX), one of the X chromosomes becomes inactive to ensure that the dosage of X-linked genes is balanced with males, who have only one X chromosome (XY).

2. **Identifying the Options**: The question provides four options:
- a) Autosome
- b) X chromosome
- c) Y chromosome
- d) Male sex only

3. **Analyzing Each Option**:
- **Autosome**: Autosomes are non-sex chromosomes and do not relate to Barr bodies.
- **X chromosome**: This is the correct option, as Barr bodies are specifically associated with the inactivation of one of the X chromosomes in females.
- **Y chromosome**: The Y chromosome does not form Barr bodies, as it is not subject to inactivation in the same way as the X chromosome.
- **Male sex only**: This option is incorrect because Barr bodies are not present in males, who have only one X chromosome.

4. **Conclusion**: Since Barr bodies are formed from the inactivation of one of the X chromosomes in females, the correct answer is option b) X chromosome.

**Final Answer**: Barr body is associated with the X chromosome (Option b).

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