All Female Mammals Have One Active X Chromosome Per Cell Instead Of Two. What Causes This?

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All Female Mammals Have One Active X Chromosome Per Cell Instead Of Two. What Causes This?

A) crossing over between the XIST gene on one X chromosome and a related gene on an autosome B) inactivation of the XIST gene on the X chromosome derived from the male parent C) activation of the XIST gene on the X chromosome that will become the Barr body D) attachment of methyl (CH3) groups to the X chromosome that will remain active E) activation of the BARR gene on one X chromosome, which then becomes inactive
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activation of the XIST gene on the X chromosome that will become the Barr body
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