Question

When does X chromosome inactivation?

Answer 1

The X-chromosme is in-activated by heterochromatization process.

Explanation:

1. The X-Chromosome of mammal is in-activated by the process of heterchromatization. In this process, the euchromatic zones are minimised or totally suppressed.
2. During the process of in-activation, the X-chromosome is compactly arranged. The compactly arranged chromosomal parts are un-able to enter into the process of multiplication or transcription. Thank you