N a village where the proportion of individuals who are susceptible to malaria (genotype hba/hba) is 0.31, and the population is assumed to be at hardy-weinberg equilibrium, what proportion of the population should be heterozygous hba/hbs

Hardy-Weinberg equilibrium is the theorem that states that allele and genotype frequencies will remain constant from generation to generation and random mating happens here. This also suggests that there is equal chance of living for everyone. The portion of population that should be heterozygous HbA/HbS is 0.49.