I dont know I'm not an expert on huntington disease or ball pythons for that matter. Im learning something everyday just like everybody else.(except those who already know it all). What I am saying is just a basic rule of thumb that I have heard, "dominants dont have homo forms only co dom/in dom/and recessive do". Just what I have always been told and have read many times here on this forum. I dont know and dont care really, I know what all my snakes are and the possibilities when I breed them together.