Sickle cell anemia is a condition caused by a mutation in one letter in DNA that results in a change of one amino acid i

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Sickle cell anemia is a condition caused by a mutation in one letter in DNA that results in a change of one amino acid i

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Sickle cell anemia is a condition caused by a mutation in one letter in DNA that results in a change of one amino acid in the protein called hemoglobin.
This change results in the wrong shape of hemoglobin and its reduced efficiency in carrying oxygen.
If we say “someone has a gene for sickle cell anemia,” what do we actually mean? Does the gene cause the disease? And if not the gene, then what is the cause of the disease? What does the person with "a gene for sickle anemia" really have? And what do other people have instead?
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