Explore sickle cell disease and its evolutionary basis in greater depth by watching the videos and reading the article (links below). Also, make sure to consult the section on the sickle cell and malaria in Chapters 4 and 14. Then answer the four questions below. You may either type your answers into the text box or attach your responses in a file and upload.
Malaria and Sickle Cell Anemia (HHMI Biointeractive Video)
Malaria and Sickle Cell Anemia HHMI BioInteractive Video (Links to an external site.)
Video clip on Malaria, Natural Selection and New Medicine (American Museum of Natural History)
How One Child’s Sickle Cell Mutation Helped Protect the World from Malaria (New York Times science writer Carl Zimmer)
1. Sickle cell anemia follows a single-gene pattern of inheritance, with two alleles: one allele (S) produces normal hemoglobin, and the other (s) produces abnormal hemoglobin. Describe the phenotype outcome for each of the three possible genotypes (SS, Ss and ss), with regard to sickle cell anemia and malaria.
2. How did human farming influence the evolution of the sickle cell allele in human populations?
3. Malaria is a deadly disease in its own right. According to the video on malaria, natural selection and new medicine, what have scientists learned about malaria from studying the human genome as well as that of the malaria parasite? How can they use evolution to design new medical treatments?
4. Looking to the future, what changes to the frequency of the sickle-cell allele do you envision as most likely, and why? (In other words, do you envision it becoming more common or less common in human populations?) What factors (technology, climate change, etc) might be driving those changes?
1- all parts of all questions thoroughly. Answers are factually accurate and do not rely on unapproved sources. For Q. 4, it does not matter which viewpoint is taken, but response should be supported with evidence from the sources.Uses source
2- material appropriately. Specific references are made to readings, video and textbook. Does NOT use unauthorized source material.
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