Sickle cell anemia is an inherited disease in which red blood cells become disto

Question

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.

Explanation / Answer

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

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