Sickle cell anemia is an inherited disease in which red blood cells become distorted and deprived of oxygen. A person with two sickle cell genes will have the disease, but a person with only onesickle cell gene will have a mild, non-fatal anemia called sickle cell trait. Using S to represent a healthy gene, and s the sickle cell gene, the table shows the four possibilities for the children of two Ssparents. Find the probability that these parents give birth to a child who has sickle cell anemia.First SParent SSecond ParentSSSsSSSSsSP(child has sickle cell anemia =(Simplify your answer.)

Here, we have a table given. We are supposed to find the prbability that these parents have given birth to a child who has no sickle cell anemia. S represents healthy gene and s represent the sickle cell. A perosn with two sickle cell gene will have the desease but a person with only one sickle cell gene will have mild, non-fatal anemia. now there are total of four events as listed below, SS, Ss, sS, ss. Hence n=4 But we know that, a perosn with two sickle cell gene will have the desease but a person with only one sickle cell gene will have mild, non-fatal anemia. Hence the only event supporting the child to have anemia is ss So, the required probability is =1/4 = 0.25