Answer
$\frac{1}{4}$
Work Step by Step
P(E) = $\frac{no. of outcomes in favor}{Total no of outcomes}$
A person with two sickle cell genes will have the disease, but a person with only one sickle cell gene will have a mild, nonfatal anemia called sickle cell trait.
E: Is healthy
Favorable outcomes= {SS}
P(E) = $\frac{1}{4}$
