Evolution of Drosophila Ananassae Populations from the South Pacific and Southeast Asia PDF Download
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Author: Shelly Gray Smith
Publisher:
ISBN:
Category : Fruit-flies
Languages : en
Pages : 84
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Author: Shelly Gray Smith
Publisher:
ISBN:
Category : Fruit-flies
Languages : en
Pages : 84
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Author: Austin N. Craven
Publisher:
ISBN:
Category : Drosophila ananassae
Languages : en
Pages : 42
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"There is still much work to be done in Biology to study and understand the mechanisms that drive the generation of new species. The model organism Drosophila ananassae represents and ideal model to untangle these issues. Previous genetic and mate discrimination studies of D. ananassae showed evidence that populations in Southeast Asia, and the South Pacific may be at a nascent stage of speciation (Schug et al. 2007, 2008). Subsequent preliminary studies demonstrated a potential postmating isolation barrier may exist between Bogor, Indonesia isofemale line 13 (BOG13) and females from Trinity Beach, Australia isofemale line 12 (TB12), which when hybridized and backcrossed to BOG13 females showed a decrease in offspring production. This may reflect a genetic isolation barrier, or alternatively, the effects of infection of one population or the other with endoparasite Wolbachia which is known in other organisms to cause postmating reproductive barriers. My study tested the hypothesis that the postmating barrier present between these two populations is driven by Wolbachia infection. I found that TB12 was infected with Wolbachia and BOG13 was not. A full reciprocal backcross preformed between these isofemale lines, and replicate using a TB12 isofemale line cured of the Wolbachia infection, revealed results consistent with Wolbachia-induced cytoplasmic incompatibilities (CI), that were removed when cured of the Wolbachia infection. A screen of additional strains previously shown to have high levels of mate discrimination showed the possibility that Wolbachia infection may have influenced the evolution of postmating reproductive barriers in additional populations of D. ananassae from throughout Southeast Asia and South Pacific. However, my mate discrimination experiments using infected versus cured isofemale lines from Bogor, Indonesia and Trinity Beach, Australia indicated that it is unlikely that Wolbachia infections directly influence mate discrimination behaviors, but are likely having an influence on postmating reproduction. Taken together this suggests that Wolbachia infections in populations of D. ananassae throughout its range in Southeast Asia and the South Pacific may have a significant influence on population divergence and speciation."--Abstract from author supplied metadata.
Author: Pranveer Singh
Publisher: Springer
ISBN: 9788132234258
Category : Science
Languages : en
Pages : 106
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This book introduces readers to classical population genetics and the ways in which it can be applied to practical problems, including testing for natural selection, genetic drift, genetic differentiation, population structuring, gene flow and linkage disequilibrium. It provides a comprehensive monograph on the topic, addressing the theory, applications and evolutionary deductions, which are clearly explained using experimental results. It also offers separate chapters on origin, establishment and spread of chromosomal aberrations in populations along with details of culturing, maintaining and using Drosophila ananassae (genetically unique and the most commonly used species along with D. melanogaster) for genetic research. Encompassing topics like genetics, evolution, Drosophila genetics, population genetics, population structuring, natural selection and genetic drift in considerable detail, it provides a valuable resource to undergraduate and postgraduate students, as well as researchers at all level. This book explores some fundamental questions concerning the role of natural selection and genetic drift on the degree of inversion polymorphism. India, with its wide diversity in geo-climatic conditions, provides an excellent platform to conduct such studies. The book showcases sampling records of inversion frequencies in natural Indian populations of D. ananassae that cover more than two decades. It highlights case studies in which sampling data on inversion frequencies was combined with that from earlier surveys, generating a time series that allows the evolutionary dynamics of inversion polymorphism to be explored. Such long time series are rare but nonetheless crucial for studying the evolutionary dynamics of inversion polymorphism. The population-genetic analysis discussed is unprecedented in terms of its temporal (two decades) and spatial (most regions of India covered) scale and investigates the patterns of polymorphic system in D. ananassae to see if there is any temporal divergence. It endeavors to present a holistic picture of inversion polymorphism across the country (India). Chromosomal aberrations, particularly paracentric inversions, are used as a tool for discussing population genetic studies, helping human geneticists, gynecologists and other medical professionals understand why some aberrations are fatal in humans, with affected embryos often not surviving the first trimester of pregnancy, while similar aberrations in Drosophila flies aid in their adaptation to the environmental heterogeneity across the globe.
Author: Yoshiko N. Tobari
Publisher:
ISBN:
Category : Drosophila
Languages : en
Pages : 316
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Author: Irina Brake
Publisher: BRILL
ISBN: 9004261036
Category : Science
Languages : en
Pages : 412
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Book Description
Concerns about global biodiversity are rising dramatically, yet we are lagging behind in the most basic prerequisite for its understanding and conservation: the inventory. Insect species may make up five or ten times the number of all other plant and animal species combined, and as such they represent one of the major challenges in biosystematic science. World Catalogue of Insects is an initiative aiming at compiling worldscale, authoritative catalogues of monophyletic insect taxa. Volumes in this series contain standard nomenclatoral information on all names pertaining to the taxon treated, including type locality and distribution to the extent this is relevant. Additional information is optional, e.g., location, status and condition of types; biology; bibliographical information; pest status; vector status; etc. This volume nine focuses on Drosophilidae (Diptera). (Series: World Catalogue of Insects)
Author:
Publisher:
ISBN:
Category : Genetics
Languages : en
Pages : 590
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Author: M. Ashburner
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 570
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 306
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"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Author:
Publisher:
ISBN:
Category : Entomology
Languages : en
Pages : 930
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1732
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