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.
Results
Showing 1 to 20 of 96 for “"genetic drift"”.
-
Investigating the relative influence of genetic drift and natural selection in shaping patterns of population structure in Delphinids (Delphinus delphis; Tursiops spp.)
… are thought to occur mainly due to drift.
-
The characterization of MHC Class II genes of the Nile crocodile (Crocodylus niloticus) : an investigation of mechanisms that shape genetic diversity in natural populations
… including the processes of gene conversion, genetic drift and selection; in the presence of many pathogens balancing selection is thought to be the dominant mechanism by which selection operates. Amino acid substitutions within the peptide-binding region (PBR) of MHC genes further supports …
-
Morphometric Theory and Application to Evolution and Biogeography in Argopecten (Bivalvai: Pectinidae) From the Southeastern United States
… implies adaptative evolution and precludes genetic drift.
-
Cranial form evolution and functional adaptations to diet among papionins : a comparative study combining quantitative genetics, geometric morphometrics, and finite element analysis
… divergence of papionin cranial forms by random genetic drift with a quantitative genetic model (previously tested for acceptable type I error rates); if rejected, different cranial forms should reflect adaptations to the particular biomechanical demands of different diets. To study those …
-
Application of differential evolution to power system stabilizer design
… many Evolutionary Algorithms (EAs) such as Genetic Algorithms (GAs) have been proposed to optimally tune the parameters of the PSS. GAs are population based search methods inspired by the mechanism of evolution and natural genetic. Despite the fact that GAs are robust and have given …
-
Population Fragmentation and Genetic Diversity of Chrosomus sp. cf. saylori (Clinch Dace)
… in southwestern Virginia. Field sampling and genetic analysis support the hypothesis that Clinch Dace populations are small and fragmented. Analysis of neutral genetic markers shows that most Clinch Dace populations have undergone past bottleneck events and are being operated upon by random …
-
Response to S1 recurrent selection and estimation of genetic parameters in effective population sizes of the BS11 maize population
… into that due to additive and dominance genetic components, and (3) to examine changes in the correlated traits. Four effective population sizes 5, 10, 20, and 30 were developed by S1-progeny selection in the BS11 maize population using a 20% selection intensity designated as 5-S1, 10-S1 …
-
The Creation of Metropolitan Amazonia: Genetic Consequences of Migration and Urbanization
Uniparental genetic markers were analyzed in a sample of 182 individuals from the Peruvian Amazonian city of Yurimaguas. The site of extensive pre-Columbian and modern migratory fluctuation, contemporary Yurimaguas is characterized by considerable population diversity. Individually unique migratory …
-
Genetic and Morphological Analyses of White Spruce in North America
… The effects of migration are often preserved in genetic patterns of contemporary forests, and can include genetic drift during population fragmentation as well as genetic bottlenecks during founder events. Besides migration, populations often change phenotypically in response to shifting …
-
Algorithms for genomics and genetics : compression-accelerated search and admixture analysis
… and analyzing signatures of admixture created by genetic drift and recombination on genome-wide, large-sample scales.
-
Leveraging genetic time series data to improve detection of natural selection
… the problem of detecting natural selection from genetic time series data. This dissertation is motivated by genomic sequence data from populations of the Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) sampled temporally during the early stages of infection from the blood of multiple …
-
The Molecular Evolution of the Serotonin System in Macaques (MACACA): a Detailed Survey of Four Serotonin-Related Genes
… TPH2, and SLC6A4. I examine the pattern of genetic variation within and between several species of macaque, and, using an approach based on molecular evolutionary theory, discern which evolutionary force – positive selection, balancing selection, purifying selection, or random genetic drift …
-
Estrutura da variação craniana em populações de Bolomys lasiurus (Lund, 1841) (Rodentia: Cricetidae) do Nordeste do Brasil
… among populations. The null hypothesis of genetic drift is not refuted.
-
Asymptotic Analysis of Some Stochastic Models from Population Dynamics and Population Genetics
… laid the foundation for contemporary population genetics. The Wright-Fisher model and its extensions have given biologists powerful tools of statistical inference that enabled the quantification of genetic drift and selection. Given the utility of these tools, we often forget that their model - …
-
The Genetic Consequences of Disjunction in Campanula Rotundifolia (Angiospermae: Campanulaceae)
… small, isolated populations will contain less genetic diversity and be genetically distinct from neighboring populations due to genetic drift. These predictions were tested for the flowering plant species Campanula rotundifolia by comparing three disjunct Missouri populations and eighteen …
-
Sensory divergence among populations of a southern African endemic horseshoe bat (Chiroptera: Rhinolophidae ): a multidisciplinary approach
… is to understand how natural selection, random genetic drift and gene flow interact to promote adaptive trait divergence within species. Environmental gradients are ideal opportunities for disentangling the relative effects of selection and gene flow in promoting local adaptation among …
-
Population Genetics of Death Valley Pupfishes (Cyprinodontidae:Cyprinodon Spp.) and the Identification of a New Retrotransposable Element Family
Study of the genetic relationships and evolutionary histories of pupfish populations (Cyprinodontidae: Cyprinodon spp.) from the remnant aquatic habitats of Death Valley was approached by exploring the genetic structure and divergence within and among populations using mitochondrial and nuclear DNA …
-
Within-host population dynamics and collective interactions of SARS-CoV-2 and influenza virus
… to the most granular levels of infection, where genetically distinct viral genomes interact within a cell. Because every virus that circulates within a host population must initially emerge within a single individual, it is crucial to understand the factors that govern viral dynamics within a …
-
A Study of Evolutionary Contingency: Characterisation, Mechanisms, and Evidence
… of contingency: random mutations, recombination, genetic drift, species sorting, and mass extinctions. I conclude that random mutations fail to be a strongsource of contingency as they are often biased towards particular mutational outcomes on account of certain physical dispositions. On the other …
-
Genetic Diversity and Camptothecin Variation in Camptotheca Decaisne
… objectives of this study are (1) to reveal the genetic diversity of Camptotheca and to identify taxa with RAPD markers; (2) to determine the camptothecin (CPT) variations within and among different populations and taxa, with tissues, season, and age; and (3) to determine the effects of …
Page 1 of 5