BioScience Dictionary

 
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Found Sickle-cell trait 1 time.

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1. Sickle-cell trait
This condition occurs in people who have one of two possible gene s (i.e., they are heterozygous for the allele ) that code for the defective hemoglobin responsible for sickle-cell anemia . The codition is diagnosed by exposing an individual's red blood cell s to a low oxygen environment; if the trait is present, the cells will turn to a sickle shape. People with this trait may suffer milder symptoms of sickle-cell anemia, or may have no symptoms. Some scientists believe the trait actually provides an evolutionary advantage in tropical environments because the slightly altered shape of the blood cells causes a person to be more resistant to malaria .