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Which of the following statements about sickle cell disease is TRUE?
It is caused by having 3 copies of chromosome 21.
It is a mild, painless illness that does not limit lifespan.
It primarily affects people of African descent.
It causes a person’s mucus to the excessively thick and sticky.

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It primarily affects people of African descent.

In parts of Africa where malaria is common, a high per cent of the population

has the sickle cell trait. This is due to the fact that people with sickle cell trait are more resistant to malaria than others.

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Answer:

It primarily affects people of African descent.

Explanation:

Scientists have found a defective gene, people borned with at least a single trait of the cell.

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