The phrase which incorrectly finishes this statement is that if both parents are carriers, they have a 50% chance of having normal children.
This is the type of disorder which involves two copies of the mutation being sufficient enough to cause the disease.
If both parents are carriers, then the chance of having normal children is zero and not 50 percent.
Read more about Autosomal recessive disorder here https://brainly.com/question/11821413