Sickle cell anemia is an inherited disease in which red bloo

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 one sickle cell gene will have a mild, non-fatal anemia called sickle cell trait. Using S to represent the sickle cell gene, and s a healthy gene, the table shows the four possibilities for the children of two Ss parents. Find the probability that these parents give birth to a child who has sickle cell anemia.

Solution

total number of sample space = 4

and number of favourableoutcomes = 1

so out of total 4 outcomes 1 will have sickle cell anemia

therefore probability is 1/4