Question

Why is there X inactivation?

Answer 1

To equalise the effects of Y chromosome.

Explanation:

Actually, you are asking about the 'X' chromosome inactvation in the sex chromosomes of human female. In human beings, the sex chromosomes combinations are "XY" and 'XX' for male and female, respectively. The Y chromosome of the male is inactive. So, one female X chromosome becomes inactive to equalise the effect an extra X chromosome. Thank You