The sickle cell anemia is genetic disorder, in which the red blood cell becomes sickle shaped instead of its biconcave shape. This condition is a autosomal recessive disorder.
The carriers are the people, who are unaffected by the disorder, but carry one recessive allele, which can cause the disease in next generation. They are hetrozygous for the trait.
It is estimated that 1 out of every 10 or 10% African American are the carriers of the Sickle cell anemia.
So, the correct answer is Approximately, 10% African Americans is a carrier for sickle-cell anemia.
<span>Richard's sympathetic nervous system will take over, and his parasympathetic nervous system will have a lesser role. The fight or flight response becomes activated by the sympathetic system. The SNS releases adrenaline and norepinephrine from the medulla of the adrenal glands, increasing the heart rate and breathing, constricting blood vessels and tightening muscles.</span>
Is about 3 hours to my understanding
Second option, to regulate what comes in and out of the cell