I need help with these 4 questions! due NOW WILL GIVE BRAINLIST What effect did the sickle cell gene have on the people who were carriers of the mutation?

Why has the sickle cell gene persisted even when sickle cell anemia is so debilitating?

What are the odds that the child of parents who each carry one normal gene and one sickle cell mutation gene will have sickle cell anemia?

What are the odds that a child of two carrier parents will also be a carrier and, thus, be protected from malaria?