Which, If Any, of the Following Statements Is Incorrect

question 39

Multiple Choice

Which, if any, of the following statements is incorrect?

• A) In X-chromosome inactivation the inactivated X chromosome is epigenetically silenced by a transcript, the XIST RNA, that is produced from the active X chromosome.
• B) The XIST RNA works by coating most of the X chromosome that is to be inactivated and then recruiting Polycomb proteins to condense the chromosome.
• C) The inactivated X chromosome carries the kinds of histone modification that are typical of heterochromatin.
• D) The pattern of X-chromosome inactivation is made randomly but once it has been established the same pattern of X-inactivation is propagated through all mitotic and meiotic cell divisions.

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