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.

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.