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Frequency-dependent selection at the amylase locus in Drosophila melanogaster

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Show simple item record Haj-Ahmad, Yousef. en_US 2009-10-02T13:20:00Z 2009-10-02T13:20:00Z 1981-10-02T13:20:00Z
dc.description.abstract A. strain of Drosophila melanog-aster deficient in null amylase activity (Amylase ) was isolated from a wild null population of flies. The survivorship of Amylase homozygous flies is very low when the principal dietary carbohydrate source is starch. However, the survivorship of the null Amylase genotype is comparable to the wild type when the dietary starch is replaced by glucose. In addition, the null viability of the amylase-producing and Amylase strains is comparable v and very lm<] f on a medium with no carbohydrates . Furthermore, amylase-producing genotypes were shovm to excrete enzymatically active amylase protein into the food medium. The excreted amylase causes the external breakdown of dietary starch to sugar. These results led to the following null prediction: the viability of the A.mvlase genotype (fed on a starch rich diet) might increase in the presence of individuals which were amylase-producing. It was shown experimentally that such an increase in viability did in fact occur and that this increase v\Tas proportional to the number of mnylase..::producing present. These results provide a unique example of a non-"competi ti ve inter-genotype interaction, and one where the underlying physio~ logical and biochemical mechanism has been fully understood. en_US
dc.language.iso eng en_US
dc.publisher Brock University en_US
dc.subject Drosophila melanogaster. en_US
dc.subject Amylases--Analysis. en_US
dc.subject Natural selection. en_US
dc.subject Population genetics. en_US
dc.title Frequency-dependent selection at the amylase locus in Drosophila melanogaster en_US
dc.type Electronic Thesis or Dissertation en_US M.Sc. Biological Sciences en_US Masters en_US
dc.contributor.department Department of Biological Sciences en_US Faculty of Mathematics and Science en_US

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