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 20 of 698 for “"Genetic Variation"”.
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Natural Genetic Variation Affecting Calcium Homeostasis
… regulator, 1,25(OH)2D, are affected by both genetic and environmental factors.</p> <p>However, the genetic architecture of these phenotypes has not been carefully studied in a controlled environment. Using genetically characterized mouse models in a controlled environment the studies in this …
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Genetic variation within the Daphnia pulex genome
<p>Genetic variation within the diploid Daphnia pulex genome was examined using a high quality de novo assembly and shotgun reads from two distinct D. pulex clones. Patterns of variation and divergence at single nucleotides were examined in physical and functional regions of the genome using …
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Genetic variation in tolerance of cold storage
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Horticulture, 1956
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Genetic variation in the aphid Pemphigus spyrothecae
This project used genetic variation to investigate dispersal, inbreeding and social behaviour in the aphid $\textit{Pemphigus spyrothecac}$. $\textit{$\textit{P. spyrothecae}$}$ is cyclically parthenogenetic, reproducing sexually on the bark of its primary host, $\textit{Populus nigra}$, and …
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Essays on genetic variation and economic behavior
… is a collection of papers in which behavior genetic methods are used to shed light on individual differences in economic preferences, behaviors and outcomes. Chapter one uses the classical twin design to provide estimates of genetic and environmental influences on experimentally elicited …
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Investigating Cadm2 genetic variation in attention and motivation
… motivation, and impulsivity control. Previous genetic studies have associated the CADM2 gene with different attentional and impulsivity traits. Continuous Performance Tests (CPT) are used to assess deficits in attentional function and impulse control in humans. This test has been used to study …
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Genetic variation of rana fuscigula in Southern Africa
… lt is important to understand the natural variation within a group, before the differences between groups can be established. This study aims to determine the molecular differences between individuals at the extreme edges of the distribution of a species. This will serve as a molecular …
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Genetic Variation in Neurotransmitter Receptors Generates Behavioral Diversity
<p>Variation in behavior among individuals is both remarkable and of great significance to society. People differ in locomotor skills, in sleep patterns, in their willingness to take risks, and in how they relate to other people. Whereas diversity enriches society, extreme behavioral deviations can …
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The Maintenance of Genetic Variation by Environmental Selection
… has been a major task of biologists. Genetic variation plays a major role in the creation of biodiversity because in contrast to environmental influence, genetic variants can be inherited. For a species in natural environments, genetic variation is generated by mutation, eliminated by …
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Genetic Variation Among Geographically Disparate Yellow Perch Broodstock Populations
… and future marker assisted selection, genetic variation revealed by microsatellite DNA was evaluated in yellow perch, Perca flavescens, from four wild North American populations collected in 2003-2004 (Maine, ME; New York, NY; North Carolina, NC; and Pennsylvania, PA), and two captive …
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Genetic variation and health in a rural Caribbean village
… from this population to investigate sources of variation in anthropometric and cardiometabolic outcomes. Mixed effect heritability models indicate that (1) variation in body mass index (BMI) is significantly shaped by genetic variation, and (2) variation between longitudinal BMI curves has not …
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Dissecting the Functional Impacts of Non-Coding Genetic Variation
<p>A large proportion of the variation in traits between individuals can be attributed to variation in the nucleotide sequence of the genome. The most commonly studied traits in human genetics are related to disease and disease susceptibility. Although scientists have identified genetic causes for …
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On the Distribution of Genetic Variation in Ecological Communities
… changes of abundance, accumulation of population genetic variation, and speciation processes, respectively). Therefore, the focus of my work is: first, to develop a model of the distribution of genetic variation in ecological communities; second, to construct a multi-scale model of the …
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Genetic Variation Within and Between Populations of Drosophila Melanogaster
The population of Drosophila melanogaster in an experimental apple orchard was monitored in 1976 and 1977. In 1977 two additional populations of D. melanogaster were also examined.
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Genetic Variation and Differentiation in Honey Bees (Apis) (Electrophoresis)
The natural distribution of the genus Apis is limited to Europe, Africa and Asia. Therefore, New World populations of A. mellifera, the familiar honey bee of commerce, are descended from importations that began with early European colonization in the Americas. In the Old World, at least two dozen …
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Genetic variation of susceptibility to fescue toxicosis in cattle
Fifteen calves of two sires were fed endophyte infected (E + ) fescue seed to quantify differences in susceptibility to fescue toxicosis among sire groups. One of the sires, a Polled Hereford, had a commercial reputation of producing calves with less severe symptoms of tall fescue toxicosis than …
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Genetic variation and parentage in the Ethiopian wolf Canis simensis
… and 2010 to (i) determine the standing amount of genetic variation after recent rabies outbreaks, (ii) reveal the family structure within and between packs using genetic parentage analysis, comparing the obtained results with existing data from field observations and (iii) investigate the effects …
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Genetic Variation of the Grotto Salamander, Typhlotriton Spelaeus in Missouri
… from Webster Co., Missouri show a high degree of genetic similarity with members of the genus Eurycea, particularly Eurycea tynerensis. In this study, Typhlotriton spelaeus collected from one location in Webster Co., Missouri was used as the outgroup. Following genetic analysis, T. spelaeus …
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Population structure and genetic variation in Hector’s dolphin (Cephalorhynchus hectori)
This thesis uses molecular genetics as a tool to uncover information about the population structure and genetic variation in Hector’s dolphin (Cephalorhynchus hectori), to track population declines and to assess the evolutionary origins and taxonomic status of this species. A high-resolution …
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