The mechanism that accounts for high frequencies of sickle cell hemoglobin in malarial environments is:

Selection -Selective advantage

Explanation:

Sickle cell hemoglobin result from the sickle shape of red blood cell instead of the ameboid shaped cell.

Malaria is a deadly disease that result from mosquito bites.

Sickle cell hemoglobin has a selective advantage because of the presence of AS genotype, the s allele in a sickle cell is an harmful recessive allele that remains in the gene pool it becomes expressed when the s allele is expressed in SS form after an AS individual have mated with either an AS or SS individual.

AS genotype has a high resistance against malaria, they have the ability to thrive making the allele s that is recessive for sickle cell thrive well in the environment of malaria in an AS individual.

hi i’m going crazy about going tomorrow and i’ll tell you what i’m doing and i wanna is a way ya