Mrs. r is pregnant and very worried that the child will have beta-thalassemia. what is the probability that the child will have beta-thalassemia major? what is the probability that the child will have no trace of the disease? choose the correct answer. choose the correct answer. 50% chance of having beta-thalassemia major; 0% chance of being disease-free 75% chance of having beta-thalassemia major; 25% chance of being disease-free 25% chance of having beta-thalassemia major; 25% chance of being disease-free 0% chance of having beta-thalassemia major; 50% chance of being disease-free 50% chance of having beta-thalassemia major; 50% chance of being disease-free