Question
Barr body is an example of:
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CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Facultative heterochromatin
Barr Body Classification
A Barr body represents an inactivated X chromosome within the somatic cells of female mammals.
Chromatin State
The chromatin forming the Barr body is highly condensed and transcriptionally silent. This condensed state is characteristic of heterochromatin.
Facultative vs. Constitutive Heterochromatin
- Facultative heterochromatin refers to regions that are transcriptionally silent but can be reversibly activated.
- Constitutive heterochromatin is permanently silenced and typically found in regions like centromeres and telomeres.
Since X chromosome inactivation can be reversed (e.g., during oogenesis), the Barr body is classified as facultative heterochromatin.
Conclusion
Therefore, the Barr body serves as a prime example of facultative heterochromatin.
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