Sickle‐cell disease (SCD) is a blood disorder. It causes an abnormality in the blood’s cells shape—the cell assumes the shape of a crescent. This also inhibits the cell’s ability to carry oxygen, leading to painful symptoms and even death. The person inherits the alleles for SCD from their parent. A person who is heterozygous for the sickle cell allele (Ss) often shows no symptoms of the disease and is considered a carrier. A person who is homozygous recessive for the sickle‐cell allele (ss) will exhibit signs and symptoms of sickle‐cell anemia. If 9% of the population exhibits signs and symptoms of the disease, what percent of the population is a carrier (heterozygous individuals)?

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