Heterozygous sickle cell anemia gives protection against -
The possession of the sickle cell allele protects these individuals against malaria because the parasite dies when potassium leaks out of RBCs as they become sickle-shaped.
Types of anemia that have protective effect against P. falciparum malaria : -
G6PD deficiency, Sickle cell anemia, Thalassemia, HbC, Pyruvate kinase deficiency
G6PD
Malaria
Thalassemia
Dengue fever