27. Which of the following statements best explains the prevalence and geographic distribution of sickle cell anemia allele (HbS).   The homozygotes for normal hemoglobin protein are always at an advantage in all environments.   Homozygous recessive individuals are selected for in malarial environments.   Heterozygous individuals are at a selective advantage in malarial environments.   Sickle cell anemia is found in high frequencies only among West Africans and their descendants.   none of the above.

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