Bryan Johnson· Author
To keep normal gene expression levels female cells suppress one of the X chromosomes randomly, called X-chromosome inactivation.
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To keep normal gene expression levels female cells suppress one of the X chromosomes randomly, called X-chromosome inactivation.
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so one of the x chromosomes typically gets inactivated in each cell and it tends to be random as people get older as women get older there tends to be a bias in one or the other x chromosome so one is inactivated more than the other
early in life seems to be random half half of the cells your paternal X is inactivated half of it your maternal X but over time you get a kind of a selection for one or the other