Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"genetic bottleneck"”.
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Insights Into Mitochondrial Genetic and Morphologic Dynamics Gained by Stochastic Simulation
… are not completely understood. The mitochondrial genetic bottleneck has puzzled biologists for a long time. Approximate models of genetic bottleneck proposed in the literature do not accurately model underlying biology. Recent studies indicate mitochondrial morphology changes during cellular aging …
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Genomic diversity and structure among South and East Asian human populations
Genetic variability is a complex concept that is affected by many factors. Studying the genetic variability within the human population provides a better understanding of how populations evolve. The genetic variability within modern humans resulted from different conditions experienced in different …
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Genetic Structure of the Copperhead (Viperidae: Agkistrodon Contortrix Mokasen) at its Most Northern Distribution
… reproduction in a laboratory setting and phylogenetic history. Thus, employing DNA-based molecular techniques to study the natural history of <em>A. contortrix</em> will broaden our knowledge of molecular ecology in North American pitvipers, and particularly in a non-threatened species that can …
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The demography of Red Sea reef fishes since the Last Glacial Maximum
… maculosus, and Carcharhinus melanopterus. The genetic bottleneck experienced during the Last Glacial Maximum (LGM) was not as small as was expected, highlighting the importance of coral reef habitat and refugia. Studying the impact of the LGM on Dascyllus marginatus, a species with a restricted …
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The population structure of wild Scottish brown trout (Samo trutta L.1758) of Loch Maree, Wester Ross: spatial genetic distribution after population decline
… in archives and have yet to undergo population genetic analysis. This study aims firstly to determine the best approach to characterising the genetic structure of the Salmo trutta population of Wester Ross with the available archived tissues/specimens. The population structure observed will then …
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Genotypes to Phenotypes: Genomic attributes that impact Genome-wide Associations in peanut (Arachis hypogaea. L).
… event between two diploid progenitors, and the genetic bottleneck at the allotetraploid origin, have contributed to the narrow genetic diversity in this cultivated species. Using a set of 16 diverse peanut accessions, we evaluated and showed that subgenome exchanges accounted for > 10% of the …
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Theoretical and Statistical Approaches to Understand Human Mitochondrial DNA Heteroplasmy Inheritance
… in heteroplasmy level causing uncertainty for genetic counseling. The aim of this dissertation is to gain insight into how human mtDNA heteroplasmy is inherited. By working closely with our experimental collaborators, the computational simulation of mouse embryogenesis has been developed in our …
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Multiple origins of 'Senecio cambrensis' Rosser and related evolutionary studies of British 'Senecio'
… higher level of inbreeding. The reduced level of genetic variation in the radiate variant at these loci is presumed to be due to the recent origin of the radiate morph in Britain. Of additional interest was the finding that S. squalidus contains a low level of genetic variation compared with most …
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The conservation ecology of the Dorcas gazelle (Gazella dorcas) in North East Libya
… especially its abundance, distribution and genetic factors. Prior to this study, there was a paucity of such data relating to the Dorcas gazelle in Libya and the original contribution of this study is to begin to fill this gap. The aim of this study is to develop strategies for the …
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Population genetics of the cichlid, Cynotilapia afra (Günther 1894), in its native and introduced ranges in Lake Malawi
… zebra, and here I investigate its population genetic impacts using contemporary molecular genetic tools and analyses. Three hypotheses were tested:1. Introduction events are usually associated with a small founder population size, and the resulting genetic bottleneck is expected to reduce …
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Genetic diversity and candidate gene association analysis for growth in the South African Yellowtail (Seriola lalandi)
… as they are supposed to be, leading to a loss of genetic diversity. This is further compounded by skewed broodstock success and inconsistencies regarding phenotypic performance and size between families. Research has also focused on growth as a trait of interest. The genetic resources for the …
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Dissecting the evolutionary forces shaping sex chromosome evolution in papaya
… is caused by large scale selective sweeps and genetic bottleneck on the X. The low nucleotide diversity and strong selective sweep distinguish papaya from other sex chromosome systems. Together these results drastically expand our current knowledge if the evolutionary processes and forces that …
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Genomic Reconstruction of the Domestication History of Sinningia speciosa (Lodd.) Hiern, and the Development of a Novel Genotyping Approach
… care. Domestication often involves a complex genetic structure with contributions from multiple founder populations, interspecific hybridization, chromosomal introgressions, and polyploidization events that occurred hundreds to thousands of years earlier. Such intricate origins complicate the …
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Overcoming the domestication bottleneck in soybean: mapping domestication traits and using wild soybean to improve diversity
… the wild germplasm and to further understand the genetic basis of traits related to soybean domestication. Evaluation of G. soja-Derived Lines The genetic bottleneck caused during the domestication of soybean significantly reduced genetic diversity, as soybean landraces only contain half of the …
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Population Demographics of Cougars in the Black Hills: Survival, Dispersal, Morphometry, Genetic Structure, and Associated Interactions with Density Dependence
… by atypical cougar habitat, 3) assess the genetic structure of a semi-isolated cougar population, 4) document morphological attributes of a newly recolonized cougar population, and 5) assess population status and document effects of density dependence as they relate to overall population …
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Does variability matter? Major histocompatibility complex (MHC) variation and its associations to parasitism in natural small mammal populations
… environmental challenges is based on its genetic variation. Variability at immune genes, such as the major histocompatibility complex (MHC) genes, is assumed to be a very powerful and effective tool to keep pace with diverse and rapidly evolving pathogens. In my thesis, I studied natural …
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Patterns of association in a co-introduced insect herbivore and parasitoid wasp
… xanthotoxin, bergapten, and sphondin. Genetic variation also exists in webworm populations in the rate at which these furanocoumarins are metabolized indicating that plant chemistry can act as a selective force on insect physiology. The wild parsnip was introduced to the United States …