Sickle Cell Lab Essay

1308 Words Jun 4th, 2011 6 Pages

When Malaria is present and infects red blood cells, parasites can infect cells carrying defective hemoglobin which may result in death. Allele frequency changes over time depending on the pressures or circumstances facing a particular population. African populations are especially impacted by both malaria and sickle cell anemia. Depending on the impacted population, allele frequency often shifts and well suited organisms are likely to survive and allele frequencies can increase. When a population is effected by disease or other circumstances, allele frequency may decrease or change. HbA (normal hemoglobin) and HbS (defective hemoglobin) have varying frequencies and while the HbS gene is present in populations it is
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In this lab, I learned that individuals who are homozygous for HbS have a significant disadvantage in terms of their ability to survive. It is also evident that when Malaria impacts a population, the most “fit” alleles (those that are heterozygous) survive at

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