What is X - chromosome inactivation?

Answer 1

During early stages of development, one X chromosome in each somatic cell of a female embryo undergoes chemical modification and is inactivated. This is called X chromosome inactivation.

A small number of cells escape modification and actively express from both X chromosomes; this does not normally occur in germ cells. X chromosome inactivation is a random process that occurs in embryonic stage as parts of somatic tissue inactivate the maternal X chromosome and other parts inactivate the paternal X chromosome.

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Answer 2

Lydia Adams

X-chromosome inactivation is a process in which one of the two X chromosomes in female mammals is randomly inactivated during embryonic development. This ensures that females, like males, have only one active X chromosome in each cell.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.