Some blindness can be genetic flaws, for instance - if babies are born without the correct receptors to send signals to and from the central nervous system, or if they are lacking parts of the eye etc. However, a lot of blindness comes from problems in the womb, or while birthing or even developed from some sort of disease, which is not necessarily genetic. As far as dwarfism, my dad is 5'5", and I am 4'11". My kids are shorties too, I'll tell you if they prove out in a few years *snicker*