It gets wrapped up in a ball and is not used with the exception of a few genes. |
It's like flipping a coin. If you look at a woman in any given (bodily) tissue, you'd expect about half of the cells to inactivate one X, and half would inactivate the other. |
When we looked at women who have gay kids, in those with more than one gay son, we saw a quarter of them inactivate the same X in virtually every cell we checked. That's extremely unusual. |