It’s just a problem with the interactions between cells, it sounds like. You’re correct, X Inactivation virtually completely disables one X chromosome, it just happens after cells have divided several times, so some clusters of the developing embryo have one X chromosome while other clusters have the other chromosome.
MaygeKyatt t1_jaaccl4 wrote
Reply to comment by Germanofthebored in Is there a genetic disease where the heterozygote has more severe disease symptoms than the homozygote? by Altranite-
It’s just a problem with the interactions between cells, it sounds like. You’re correct, X Inactivation virtually completely disables one X chromosome, it just happens after cells have divided several times, so some clusters of the developing embryo have one X chromosome while other clusters have the other chromosome.