Why can being carrier of the disorder be an advantage in countries where there's a lot of malaria?

Being a carrier of certain genetic disorders, such as sickle cell trait, can provide a survival advantage in malaria-endemic regions. The presence of the sickle cell trait offers some protection against severe forms of malaria, as the malaria parasite has a harder time surviving in sickled red blood cells. This selective advantage allows carriers to have a better chance of surviving and reproducing in areas where malaria is prevalent, leading to a higher frequency of the trait in those populations.