Question

the effect of sickle cell disease is misshapen red blood cells. which is the cause of the disease? a mistake during cytokinesis a mutation in the dna sequence an environmental disturbance a contagious disease

Explanation:

Sickle - cell disease is a genetic disorder. It is caused by a point - mutation in the DNA sequence that codes for the beta - globin part of hemoglobin. This mutation leads to abnormal hemoglobin (hemoglobin S) which causes red blood cells to become sickle - shaped. It is not due to cytokinesis errors, environmental disturbances, or being a contagious disease.

Answer:

B. A mutation in the DNA sequence