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2:38
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MedLive By Dr. Priyanka
Two X chromosomes… but only one stays active! 🧬
According to the **Lyon Hypothesis**, one X chromosome in each female somatic cell is randomly inactivated during early embryonic life and forms a **Barr body**. The exam-ready rule: Male (XY) = 0 Barr bodies Female (XX) = 1 Barr body Barr bodies = Number of X chromosomes − 1 Save this reel—the Barr Body Paradox will never confuse you again ...
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