Is it hereditary? From what I can tell, a gonadal mosaic happens when a mutation occurs in an early stage of embryonic development, so that makes me think that no, it isn't hereditary. I mean, obviously it is passed on to the children if they get one of the flawed eggs, but I didn't get it from my mother, right?? So if I am a gonadal mosaic and not a DNA carrier, my mom and sisters don't need to…