Sickle-cell anemia has been gradually reduced in the United States, but not in West Africa. This discrepancy is an example of a genetic disorder that is influenced by environmental factors
Describe sickle-cell anemia and the reason for the discrepancy between the United States and West Africa.
What will be an ideal response?
A good answer would include the following key points:
• Sickle-cell anemia is a blood disorder that afflicts people of African descent.
• Symptoms include poor appetite, stunted growth, swollen stomach, and yellowish eyes.
• People with the most severe form of the disorder do not live beyond childhood.
• Incidence of sickle-cell anemia is lower in the United States than in West Africa.
• The sickle cell gene increases immunity to malaria, making the presence of the sickle cell gene an advantage in West Africa (as opposed to the US).
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