People with sickle-cell trait must be heterozygous.

Name: People with sickle-cell trait must be heterozygous.
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Sickle-cell trait is an inherited condition where an individual inherits one normal hemoglobin gene and one abnormal hemoglobin gene from their parents. This makes them heterozygous for the sickle-cell gene. Homozygous individuals with two copies of the abnormal gene have sickle-cell disease.

People with Sickle-Cell Trait Must Be Heterozygous