A Single Gene Protects, but Two Genes Can Kill
A medical breakthrough of the past few years is the discovery that having only one gene for a deadly disease can protect a person from other illnesses, which is why these diseases, like cystic fibrosis and sickle cell anemia, persist in the human population. This realization came about when it was discovered that sickle cell anemia, a genetic condition that only exists among black people, offers protection from malaria, if the person only inherits one of the genes. Something similar has now been discovered for Alzheimer’s disease.
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