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Dosage Compensation: Barr Body
Concepts tested here
- Barr bodies = X chromosomes minus one
All Questions
2001 AIPMT 1 question
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Number of Barr bodies in XXXX female : -In mammals, only one X chromosome remains active in each cell; all extra X chromosomes are condensed and inactivated as Barr bodies (Lyon hypothesis).
Number of Barr bodies = number of X chromosomes $- 1$.
For XXXX: $4 - 1 = 3$ Barr bodies.
(A normal XX female has 1 Barr body, and a normal male has none.)