Why is there X inactivation?

Answer 1

To equalise the effects of Y chromosome.

Since the male Y chromosome is inactive, one female X chromosome becomes inactive to balance the effect of an extra X chromosome. In actuality, you are asking about the 'X' chromosome inactivation in the sex chromosomes of human females. In humans, the sex chromosome combinations are "XY" and 'XX' for male and female, respectively.

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Answer 2

Emma Arvizu

X inactivation ensures dosage compensation between males (XY) and females (XX) by randomly silencing one X chromosome in each female cell, preventing gene overdosage from the X chromosome.

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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.