Question

All female mammals have one active X chromosome per cell instead of two. What causes this to happen? (A) activation of the XIST gene on the X chromosome that will become the Barr body (B) activation of the BARR gene on one X chromosome, which then becomes inactive (C) inactivation of the XIST gene on the X chromosome derived from the male parent (D) attachment of methyl (CH₃) groups to the X chromosome that will remain active

Answer 1

Correct option C)  inactivation of the XIST gene on the X chromosome derived from the male parent.

Embryonic development in females and one of the X chromosomes is rand come and permanently inactivated is cells than egg cells. The phenomenon is called X- inactivation or lyonization.

X- inactivation which is called lhyonization , is process by which one of the copies of Chromosome inactivated in therian female mammals. The inactivated X- chromosome is silenced by being packaged into a transcriptionally inactive structure called hetero chromatin.

In case of both X chromosomes and all of their genes were to be activate in women and they would have twice as many copies of the opposite that they have in men.

To learn more about  X- inactivation or lyonization here

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