At the onset of X chromosome inactivation, the Xist and Tsix genes are coexpress
ID: 49299 • Letter: A
Question
At the onset of X chromosome inactivation,
the Xist and Tsix genes are coexpressed on only the future active X chromosome.
the Xist and Tsix genes are coexpressed on both X chromosomes.
the Xist and Tsix genes are coexpressed on only the future inactive X chromosome.
the Xist gene is expressed on only the future active X chromosome, while the Tsix gene is expressed on only the future inactive X chromosome.
the Tsix gene is expressed on only the future active X chromosome, while the Xist gene is expressed on only the future inactive X chromosome.
Explanation / Answer
the Tsix gene is expressed on only the future active X chromosome, while the Xist gene is expressed on only the future inactive X chromosome.\
the XIST allele must be turned off on one X chromosome to maintain its activity in cells of both sexes.
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