Question

what will happen to the frequency of the recessive allele for the hbs gene when there is an outbreak of malaria?
the frequency will increase.
the frequency will decrease
the frequency will remain constant.
it is impossible to predict how the allele frequency will change.
the frequency will be cut in half with each generation.

Explanation:

Individuals heterozygous for the HbS gene (carriers) have resistance to malaria. During a malaria outbreak, these carriers survive at higher rates than those without the HbS allele. This survival advantage leads to increased transmission of the recessive HbS allele to offspring, raising its frequency in the population.

Answer:

The frequency will increase.