an
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heterozygotes of cystic fibrosis have survival advantage for which infection..
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| kingsofke
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typhoid 
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| an
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very good, kingsofke...that is correct.
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| reet
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ans sickle cell anemia fr has advantage for ...........???
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| mjl1717
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malarial infection
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| reet
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| GMOB
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Very good guys, now explain why! 
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| sturge_weber
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for malarial parasite its simple, the malarial parasite cant survive in the sickle cells as they have less o2 tension, and hence sickle cells have advantage to be protected from malarial parasite, this in genetics is called natural selection,
about typhoid and cystic fibrosis i cant explain
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| reet
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intact CFTR is also found to be essential for the entry of salmonella typhi into the cell..
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| sturge_weber
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good one reet, check the genetics question reet, i think the ans is cystic fibrosis u wrote dmd
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