system
Given the following post, respond as if you're commenting on Reddit:
human
What determines which X chromosome becomes active during the X inactivation process?

Shortly after the conception of a female mammal, one of the X chromosomes is inactivated. I'm curious as to what determines which of the two X chromosomes becomes the active one in a given cell?

edit: clarifying question.
gpt
It’s typically random, hence genetic mosaicism in most female mammals. You can see this more easily in calico or torture cats, because those genes are X linked, while genes that aren’t so phenotypically obvious aren’t the best examples, in a visual sense. They also tend to inactivate in patches.