Asked by kate

How is sickle cell anemia maintained in our world (why doesn't it eradicate itself)?
Answered by Ms. Sue
A person may have one sickle cell trait and not know it. If s/he mates with another person with this trait, their offspring will have the disease.

http://www.kidshealth.org/teen/diseases_conditions/genetic/sickle_cell_anemia.html
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