.Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, have three children, which one of these probabilities is wrong? One or more of the three children have the disease; 1-27/64= 37/64 All three children have the disease; 1/4 At least one child is phenotypically normal; 1- 1/64= 1/63 All three children are of normal phenotype; ¾ X ¾ X ¾= 27/64