Errol's father carries two recessive genes for sickle-cell anemia, and errol's mother carries two normal dominant genes. therefore, errol has inherited from his parents.

Inherited a resistance to malaria

Explanation:

Errol's father carries two recessive genes for sickle-cell anemia, and Errol's mother carries two normal dominant genes. Therefore, Errol has inherited a resistance to malaria from his parents.

Errol will have a heterozygous genotype (AS). Scientifically, individuals that a carriers of the sickle cell allele have been reported to be resistant to malaria causing protozoa called plasmodium unlike the homozygous dominant allele AA which is susceptible to malaria infection or the recessive allele SS which causes sickle cell disease.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

the correct answer is d