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 a healthy gene, and s to represent the sickle cell gene, make and show a genetic table showing the four possibilities for the children of two Ss parents. Find the probability that these parents give birth to a child who has the sickle cell trait.

Explanation / Answer

So the 4 possibilities are SS , Ss, Ss, ss

Two out of the four cases (Ss cases) cause sickle cell trait

Therefore the probability that these parents give birth to a child who has the sickle cell trait. = 1/2

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