In dominantly inherited EB, the mutated gene is from only one parent who has the disease. When a disorder is dominantly inherited, only one faulty gene is required for the disorder to occur. A parent with a dominant form of EB has a 50-50 chance with each pregnancy that the baby will have EB. Birth order and sex of the child do not affect inheritance. If the abnormal gene is not passed to the child, the child will not have EB and cannot pass on the disorder.