Answer:
A. 50 percent
Step-by-step explanation:
Wilson disease is an autosomal recessive disease, it means that if a person has developed the disease, he must have two copies of the allele encoding disease. Suppose the allele of Wilson's disease is encoded by the letter T while normal allele is encoded by l.
Let's see what will happen if a man with Wilson's disease marries a woman who is a carrier for Wilson's disease.
Father with disease X Carrier mother
P1: TT x TI
Gametes: T : T x T : I
Offspring: TT: TI : TT: TI
TT: Children with disease: 50%
TI: Children who are carrier: 50%
So 50 % of the kids will have the disease while other 50% will be the carriers of disease to their next offspring.
Hope it helps!