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a child must inherit two copies of the defective gene in order to have a cystics fibrosis but when it come to sickle-cell anemia it is a disease passed down through families in which red blood cells from an abnormal sickle or crescent shape.Red blood cells carry oxygen to the body and are normally shaped like a disc so what causes sickle-cell anemia is the two copies that they get from both parents which gets passed down through families.

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12y ago

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