In mammals, females have two X chromosomes and males have one X chromosome. Equal expression of X-chromosome genes in both sexes is ensured by
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- Dosage compensation
- Histone code
- RNA silencing
- Heterochromatin formation
The Correct Option is A
Solution and Explanation
Dosage compensation ensures that the expression of X-linked genes is balanced between males (XY) and females (XX).
Step 2: Mechanism in mammals.
In female mammals, one X chromosome is randomly inactivated during early embryonic development (Lyonization), forming a Barr body.
Step 3: Conclusion.
Hence, equal expression is achieved through dosage compensation.
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