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Which one of the following is the only active gene in the inactivated X chromosome?

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Which one of the following is the only active gene in the inactivated X chromosome?

(a) XIST

(b) XCE

(c) Histone coding gene

(d) Ribosomal gene

This question was addressed to me by my college director while I was bunking the class.

I'm obligated to ask this question of Dosage Compensation Mechanism for X linked Genes in division Chromosomes and Sex Determination of Cytogenetics

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The correct answer is (a) XIST

The best I can explain: The X inactive specific transcript (XIST in humans/ Xist in mice) gene, is located in the XIC, it’s expressed exclusively from the inactive X chromosome, producing a 17 kb non-coding RNA that is not translated. Ribosome genes are in nucleolus.

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