A male with the
x-linked type of
NDI cannot pass it to any of his sons, but he can pass it to his daughters who will be carriers but probably will have little or no sign of the disease. A male with the
autosomal recessive type of
NDI can pass the
mutant gene to either a son or daughter but neither is likely to get the disease. If he has the
dominant type (very rare), he can pass the
gene and the disease to either a daughter or son.