Why do carriers for sickle cell anemia have a genetic advantage in some situations over those who are not carriers?

Question

Quizplus · Accepted Answer

Carriers of the sickle cell trait have a single copy of the sickle cell gene and a normal hemoglobin gene, which provides them with a selective advantage in malaria-endemic regions. The altered shape of red blood cells in carriers makes it harder for the malaria parasite to infect and survive in these cells, thus offering increased resistance to malaria.

Why Do Carriers for Sickle Cell Anemia Have a Genetic