See below: Sickle cell anemia occurs when 2 abnormal hemoglobin genes are present and a person's body produces sickle cell hemoglobin exclusively. 1 sickle cell gene and a normal gene produce sickle trait, which has no symptoms. Other abnormal hemoglobin genes can combine with a sickle cell gene and produce other types of anemia. There are several other genetic hemoglobin abnormalities.
Answered 12/10/2013
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