twincest cannot cause more abnormalities than "regular" (gross) sibling incest. If a set of twins are of diferent sex they are not identical, ie they come from different sperm and different egg. Same as any sibling pair
twincest cannot cause more abnormalities than "regular" (gross) sibling incest. If a set of twins are of diferent sex they are not identical, ie they come from different sperm and different egg. Same as any sibling pair