Imagine that a newly discovered, recessively inherited disease is expressed only in individuals with type O blood, although the disease and blood group are independently inherited. A normal man with type A blood and a normal worman with type B blood have already had one child with the disease. The woman is now pregnant for a second time. Assuming that both parents are heterozygous for the gene that causes the disease, What is the probablity that the second child will also have the disease