Homozygotes with two sickle-cell alleles are selected against because of mortality. However, heterozygotes for sickle-cell allele experience little effects of sickle allele and are more likely to survive malaria. The net effect of this exposure produced evolutionary change in areas where malaria is endemic by .a. causing sickle-cell alleleb. distortion of red blood cellsc. increasing sickle-cell allele frequencyd. increasing the number of infected mosquitoes
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Homozygotes with two sickle-cell alleles are selected against because of mortality. However, heteroz...
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