An african american couple is undergoing genetic counseling to determine the likelihood of producing children with a recessively genetic blood condition. the genetic tests reveal that the father carries the trait to produce abnormal hemoglobin, hbs, which causes crystallization in rbcs and deforms their shape when o2 is low. this condition causes painful crises and multiple infarcts and is termed

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

One function of the immune system is to attack the foreign cells to protect the body. in organ translate , the body recongnizes that the new organ is made of foreign cells. wha kind of medicine would you give a patient to increase the chances of transplate success

Which layer of the eye completely surrounds the eye except for a dark, round opening called the pupil? a. sclerab. corneac. retinad. choroidthe answer is a sclera