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Dissertations / Theses on the topic 'Genetic heterogeneity of environmental variation'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Whitehead, Ayesha L. "The effects of isolation and environmental heterogeneity on intraspecific variation in Calamoecia clitellata, a salt lake-inhabiting copepod." University of Western Australia. School of Animal Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0092.

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[Truncated abstract] This study focussed on how isolation and environmental heterogeneity in salt lakes has influenced intraspecific variation in the calanoid copepod Calamoecia clitellata. Calamoecia clitellata relies on passive vectors for dispersal, and this, coupled with the insular nature of salt lakes, may promote genetic divergence at a molecular level. When contrasting environments are involved, genetic divergence may also occur at the life history level, possibly due to local adaptation. I examined the distribution of genetic variation among 14 populations in Western Australia using m

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2

Felleki, Majbritt. "Genetic Heteroscedasticity for Domestic Animal Traits." Doctoral thesis, Högskolan Dalarna, Statistik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:du-14310.

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Animal traits differ not only in mean, but also in variation around the mean. For instance, one sire’s daughter group may be very homogeneous, while another sire’s daughters are much more heterogeneous in performance. The difference in residual variance can partially be explained by genetic differences. Models for such genetic heterogeneity of environmental variance include genetic effects for the mean and residual variance, and a correlation between the genetic effects for the mean and residual variance to measure how the residual variance might vary with the mean. The aim of this thesis was

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3

Star, Bastiaan, and n/a. "Space matters : modeling selection in spatially heterogeneous environments." University of Otago. Department of Zoology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080507.151534.

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Selection in spatially heterogeneous environments is a convenient explanation for the high levels of genetic variation observed in natural populations. Indeed, theoretical studies predict that spatial heterogeneity leads to higher levels of variation in a variety of selection models. These models, however, have assumed quite restrictive parameters (e.g., two alleles, fixed gene flow and specific selection schemes). Therefore, the effect on spatial heterogeneity is still poorly understood for a wider range of parameters (e.g., multiple alleles, different levels of gene flow and more general sel

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4

Salmela, Matti Juhani. "Adaptive genetic variation in Scots pine (Pinus sylvestris L.) in Scotland." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5662.

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Genetic differentiation in phenotypic traits among populations from heterogeneous environments is often observed in common-garden studies on forest trees, but data on adaptive variation in Scots pine (Pinus sylvestris L.) in Scotland are limited. As a result, current seed transfer guidelines are based on earlier molecular marker studies and do not take into account environmental or adaptive genetic variation. An analysis of spatial variation in climate showed substantial differences in temperature and precipitation among the native Scots pine sites in Scotland. To investigate whether different

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5

Germain, Ryan Ross. "The effects of habitat preference, environmental heterogeneity, and inter-individual variation on fitness." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54978.

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Theory predicts that animals breeding in heterogeneous landscapes should select habitat likely to maximize individual fitness, but identifying the fine-scale environmental characteristics which influence habitat preference and affect fitness is often problematic. While many studies quantify relationships between habitat preference and the reproductive success of their occupants, few are able to separate the independent effects of inter-individual variation among animals in a population from the effects of habitat on indices of fitness. In this thesis, I used up to 39 years of nesting, survival

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6

Racacho, Lemuel Jean. "The Genetic Heterogeneity of Brachydactyly Type A1: Identifying the Molecular Pathways." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32187.

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Brachydactyly type A1 (BDA1) is a rare autosomal dominant trait characterized by the shortening of the middle phalanges of digits 2-5 and of the proximal phalange of digit 1 in both hands and feet. Many of the brachymesophalangies including BDA1 have been associated with genetic perturbations along the BMP-SMAD signaling pathway. The goal of this thesis is to identify the molecular pathways that are associated with the BDA1 phenotype through the genetic assessment of BDA1-affected families. We identified four missense mutations that are clustered with other reported BDA1 mutations in the ce

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7

Gnan, Sebastian Christopher. "Genetic and environmental effects on natural variation in Arabidopsis thaliana seed size." Thesis, University of Bath, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619284.

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Maintaining global food security in the presence of a growing food demand and climate change will require an improved understanding of the genetic basis of crop yield components, and their response to environmental stress conditions, such as drought. The reproductive output of plants is further limited by partitioning of finite resources, resulting in trade-offs between traits. Here, I address these issues using Multiparent Advanced Generation Inter-Cross (MAGIC) lines of Arabidopsis thaliana for quantitative trait locus (QTL) analysis, and find that (i) there is no evidence for a genetic basi

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8

Pirkle, Michelle S. (Michelle Serpas). "Environmental Correlates to Genetic Variation in the Coral Reef Fish, Thalassoma bifasciatum." Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc500561/.

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Genetic variation was examined in bluehead wrasse, Thalassoma bifasciatum, populations along the Florida Keys. Interpretion of mean heterozygosity (H), percent polymorphic loci per population (P), genetic similarity, and F and G statistics demonstrated a clear division of wrasse populations into "northern" and "southern" groups. Correlation and cluster analyses indicated the six reefs can be grouped in a similar fashion based on genetic and environmental data. The conclusion from this analysis of wrasse populations in the Florida Keys is that substantial population subdivision occurs in respon

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9

Adhikari, Eliina. "Genetic and Environmental Variation on Mineral Nutrient Concentration in Pea and Lentil Seed." Thesis, North Dakota State University, 2015. https://hdl.handle.net/10365/27255.

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Current food supply is expected to be insufficient to support the growing population both in quantity and nutritional quality; therefore, the need to breed for higher yield and greater nutritional quality is urgent. Twenty-five dry pea genotypes, 25 Turkish red lentil and 23 green lentil genotypes were tested across different locations of North Dakota to quantify the nutrient concentration and to characterize the genotype and the environmental factors affecting nutrient concentration. Significant genotypic, environmental and genotype-by-environment interaction was present for Ca, Cu, Fe, K, Mg

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10

Boixel, Anne-Lise. "Environmental heterogeneity, a driver of adaptation to temperature in foliar plant pathogen populations?" Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASA010.

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Les facteurs environnementaux, au premier rang desquels la température, ont un impact sur la biologie des micro-organismes foliaires. Ils peuvent aussi modifier significativement leurs dynamiques populationnelles, voire leurs trajectoires évolutives. Classiquement, les modèles épidémiologiques, utilisés pour mieux gérer les maladies des plantes, intègrent l’influence des conditions météorologiques. Ils s’intéressent surtout à des réponses et des effets moyennés, ne tenant compte ni des variations des réponses individuelles, ni de l’hétérogénéité des changements environnementaux aux échelles ré

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11

DeWoody, Jennifer. "Evolutionary and genetic basis of morphological variation in Populus nigra (European black poplar)." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/203957/.

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Changes in precipitation over the next century may impact the distribution of species, particularly in southern Europe, where droughts are predicted to increase in frequency. In forest trees, intraspecific variation in leaf size, branching architecture, and growth rate among populations are considered adaptive and likely related to climatic differences between sites. A previous common garden study of Populus nigra L. showed morphological variation to be highly heritable and significantly differentiated among populations, indicating phenotypic differences may be adaptive. This project studied t

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12

Langley, Kate. "A genetic study of attention deficit hyperactivity disorder : examining environmental influences and phenotypic variation." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/54081/.

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This work highlights phenotypic heterogeneity and how this may index underlying aetiological heterogeneity. It also indicates the importance of environmental variables and investigating Gene x Environment interactions in molecular genetic studies of ADHD.

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13

Finer, Sarah. "Epigenetic variation associated with genetic and environmental factors in the aetiology of Type 2 diabetes." Thesis, Queen Mary, University of London, 2013. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8677.

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Type 2 diabetes, as a complex disease, has a range of genetic and environmental factors that underpin its aetiology. It is hoped that the emerging study of epigenetic processes will provide the necessary mechanistic insight into the genetic and environmental interactions that, to date, are poorly understood. This thesis considers the role of DNA methylation, an epigenetic modification, in the aetiology of type 2 diabetes. A range of different genome-wide and whole genome techniques are applied to a study of established type 2 diabetes and experimental models (human and animal) of fetal program

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14

Wood, Alice Margaret. "The role of genetic and environmental variation in the respiratory phenotype of alpha 1 antitrypsin deficiency." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/764/.

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Alpha 1 antitrypsin deficiency (AATD) is the only established genetic predisposition to chronic obstructive pulmonary disease (COPD). The development of COPD in AATD is highly variable, probably relating to complex interactions between multiple genetic and environmental factors. This thesis will describe the COPD phenotypes observed in AATD and their inter-relationships, forming the basis for examining phenotypic associations with specific candidate genes and HLA class II type. Finally it examines the potential role of ambient air pollution. Associations were seen for TNFA with chronic bronchi

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15

Simons, Andrew M. (Andrew Michael). "The effect of environmental variability on heritabilities and genetic correlations of traits in the field cricket, Gryllus pennsylvanicus /." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69659.

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The amount of heritable variation and the pattern of genetic covariation in traits are the chief determinants in the evolution of a population, at least over the short term. A preponderance of heritability (h$ sp2)$ and genetic (r$ rm sb g)$ experiments are performed under laboratory conditions which are characterized by low levels of environmental variability. This thesis describes the investigation of the effects of environmental heterogeneity on phenotypic components of variance and covariance. Full-sib families of the field cricket, Gryllus pennsylvanicus, were split between a homogeneous

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16

Husby, Arild. "Ecological genetics of populations experiencing changing environmental conditions." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/5672.

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A major goal in evolutionary biology is to understand how ecological factors shape the phenotypic and genetic variation that we observe in natural populations and in this thesis I examine how rapid changes in temperature have influenced phenotypic and genetic variation in morphological and life history traits in long-term studies of great tits. In Chapter 1 I review what is known about the effects of environmental change on natural populations, and outline the quantitative genetic framework that is available to study genetic variation in natural populations. Much focus on the effects of climat

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17

Yoko, Zebadiah Gaze. "Evolution of Intraspecific Genetic Differences Across Heterogeneous Environments and the Potential Impacts on Environmental Restoration." Thesis, North Dakota State University, 2020. https://hdl.handle.net/10365/31737.

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Genetic differences evolve between seed sources of widely distributed species that can impact restoration success. Using the herbaceous perennial Geum triflorum (Pursh) as a model species, we examine genetic differences that evolve across a species’ range in both physiology and fitness. G. triflorum occurs across highly differentiated environments consisting of prairie and alvar habitats. Seeds were collected from 22 populations across three eco-geographic regions. Through a common garden experiment in the prairie environment, I first examined differences in physiological traits between source

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18

Smith, Carolyn. "The role of genetic and environmental variation on thermal tolerance of a reef-builidng coral, Acropora millepora /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18621.pdf.

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19

Dempsey, Paula Jane. "Genetic and environmental contributions to morphological variation in the human permanent dentition : a study of Australian twins." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phd389.pdf.

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Bibliography: leaves 348-366. Elucidates the nature and extent of genetic and environmental contributions to variation in permanent tooth crown size. Sibling correlations are compared to find evidence of sex-linked genes contributing to crown size. This hypothesis was tested by comparing mean tooth size in female-male opposite-sex twins with same-sex twins, and singletons.

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20

Alshareef, Fadwa. "Genetic and virulence variation of the population of environmental and clinical isolates of the pathogenic Aspergillus fumigatus." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/genetic-and-virulence-variation-of-the-population-of-environmental-and-clinical-isolates-of-the-pathogenic-aspergillus-fumigatus(556afc33-5107-4a87-8e1e-4164f561632f).html.

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Aspergillus fumigatus has long been a focus of research, as it is the cause of the majority of Aspergillus infections. A. fumigatus is widely distributed in the environment and mainly distributed in air as conidia and is the main source of lung infection. A. fumigatus airborne counts were determined monthly during two years from the outside air environment at the University of Manchester campus and compared to total fungal airborne counts. Total fungal airborne counts were strongly seasonally associated with peak counts occurring during the summer months reaching 1,100-1400 CFU m-3and were cor

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21

House, Denise L. "Genetic Variation of Batrachospermum gelatinosum (Batrachospermales, Rhodophyta) from Eastern North America." Ohio : Ohio University, 2008. http://www.ohiolink.edu/etd/view.cgi?ohiou1212758989.

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22

Coyle, Susan M. "Genetic, morphological and behavioural variation in Scottish three-spined stickleback (gasterosteus aculeatus l.) : insights from differently armoured populations." Thesis, University of Glasgow, 2007. http://theses.gla.ac.uk/1918/.

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This thesis addressed a central theme in evolutionary biology, namely understanding the process of adaptive radiation, using the three-spined stickleback, which has become a model system in this context. In particular, the work concentrated on sticklebacks from several unique populations in the Outer Hebrides that have lost the body armour after which this species was named, lacking dorsal spines, pelvic girdle and spines and lateral plates. A first specific aim was to examine an existing hypothesis about the selective force responsible for armour loss in these populations, namely that it is a

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23

Kujala, S. (Sonja). "Dissecting genetic variation in European Scots pine (Pinus sylvestris L.):special emphasis on polygenic adaptation." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526210360.

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Abstract Adaptation through polygenic selection is a prominent feature in nature. Still, the genetic backgrounds of polygenic adaptations are often unknown. The challenges of resolving adaptive processes are related to selection being distributed over several loci with often small effect sizes. Also, even a low level of population substructure can obstruct the inference. Further, demographic factors in the history of the species, such as population size changes and range expansions leave a confounding footprint in the background genomic variation. In this thesis, polygenic adaptation was studi

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Raj, Srilakshmi Madhura. "Patterns of genetic, dietary and environmental variation in relation to type 2 diabetes and obesity among Asian populations." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610351.

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Imeh-Nathaniel, Adebobola. "Evolutionary Ecology of Arabidopsis thaliana: Interactions with Biotic and Abiotic Environmental Factors." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1351039606.

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26

Thomson, Jack Sebastian. "Stability of an evolutionary relevant behavioural trait in fish : impact of environmental and genetic variation on behaviour and physiology." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569663.

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Personality in animals describes a suite of correlated behavioural traits that distinguishes one individual from another. One important personality measure is boldness, which is related to intraspecific differences in responses to novelty, levels of activity and aggressiveness, propensity for exploration, and capacity for learning and memory. Personality and boldness have previously been linked with physiological responses to stress, termed coping styles, wherein lower stress responsiveness often correlates with bolder behaviour. Variation in these traits has important implications for how ani

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Stuber, Erica. "Phenotypic, environmental, and genetic variation as sources of intraspecific differences in behavioral sleep in wild great tits (Parus major)." Diss., Ludwig-Maximilians-Universität München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:19-184308.

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Tarnowska, Katarzyna. "Genetic structure and physiological variation of a widespread European lagoon specialist Cerastoderma glaucum (Bivalvia) living in extreme environmental conditions." Thesis, Aix-Marseille 2, 2010. http://www.theses.fr/2010AIX22001/document.

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Cette thèse de doctorat est un projet franco-polonais en co-tutelle entre le Département du Fonctionnement des Ecosystèmes Marins (l'Université de Gdansk, Pologne) et le laboratoire DIMAR (l'Université de la Méditerranée, France). La variation physiologique et la structure génétique des populations d’une espèce lagunaire, le bivalve, Cerastoderma glaucum, ont été étudiées. C. glaucum est une espèce sessile avec une phase larvaire planctonique. Elle est présente surtout dans les bassins isolés ou semi-isolés sans marée, comme les lagunes, les estuaires, les baies et les lacs. Ces habitats sont

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Peterson, Roseann. "On the genetic and environmental associations between body composition, depression symptoms and smoking behavior." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2889.

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Obesity is a serious public health crisis and recent estimates of its incidence are the highest in United States history, with 35% and 17% of American adults and children affected, respectively. The clinical definition of adult obesity is operationalized as a body mass index (BMI) greater than 30 kg/m2. Although the prevalence of common obesity has increased dramatically over the past 30 years–largely thought to be due to changes in the environment, such as high calorie diets and sedentary lifestyles—twin and family studies have shown consistently that relative body weight is under considerabl

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30

Ilk, Nadine [Verfasser], Maarten [Akademischer Betreuer] Koornneef, and Ute [Akademischer Betreuer] Höcker. "Genetic bases of plant performance in different environmental scenarios using natural variation in Arabidopsis thaliana / Nadine Ilk. Gutachter: Maarten Koornneef ; Ute Höcker." Köln : Universitäts- und Stadtbibliothek Köln, 2012. http://d-nb.info/1038226171/34.

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31

Ferreira, do Vale Pedro Filipe. "Infection outcomes under genetic and environmental variation in a host-parasite system : implications for maintenance of polymorphism and the evolution of virulence." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3189.

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Virulence (the harm to the host during infection) is the outcome of continuous coevolution between hosts and parasites. This thesis adds to a growing body of work on host-parasite interactions, and describes experiments that study the effects of variation in the genetic and the environmental contexts of infection. All of them focus on interaction between the planktonic freshwater crustacean Daphnia magna and a naturally occurring parasite, the spore-forming bacterium Pasteuria ramosa. I show that elevated minimum temperatures that facilitate parasite growth drive natural epidemics of this para

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32

Chappell, Esta Monique. "Morphology, phylogeography and drumming behaviour of a New Zealand ground weta, Hemiandrus pallitarsis : a thesis presented in partial fulfillment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Palmerston North, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/828.

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Species are one of the fundamental components of biology and the accurate delimitation of species is important in evolutionary, systematic and ecological studies, yet there is still confusion over how species can be recognised. Examining different characters allows multiple lines of evidence for successful and accurate species delimitation and identification. In this thesis, morphological, genetic and behavioural variation is investigated within an endemic species of ground weta, Hemiandrus pallitarsis, in the North Island, New Zealand. Twelve morphological characters were measured, and mitoch

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Sharma, Kalpana [Verfasser]. "Genetic variation of and environmental effects on inducibility of resistance in tomatoes (Solanum lycopersicum L.) to Phytophthora infestans (Mont) de Bary / Kalpana Sharma." Kassel : Universitätsbibliothek Kassel, 2010. http://d-nb.info/1009299522/34.

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Windes, Kathryn. "Treefrog (Hyla Squirella) Responses to Rangeland and Management in Semi-Tropical Florida, USA." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3915.

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As urban areas expand, agricultural lands become increasingly important habitat for many species. Compared to some types of agricultural land-use, ranchlands provide vast expanses of minimally modified habitat that support many threatened and endangered species. Conservation biologists can promote ecologically sound management approaches by quantifying the effects of agricultural practices on resident species. I examined the effects of pasture management, cattle grazing, and landscape characteristics on both adult and larval treefrogs in a ranchland in south-central Florida. I experimentally d

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Stuber, Erica [Verfasser], and Bart [Akademischer Betreuer] Kempenaers. "Phenotypic, environmental, and genetic variation as sources of intraspecific differences in behavioral sleep in wild great tits (Parus major) / Erica Stuber. Betreuer: Bart Kempenaers." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2015. http://d-nb.info/1074825500/34.

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El, Ayoubi Miriam Diala. "Human rhinoviruses : development of new reverse genetics methods dedicated to the improvement of the conservation of viral heterogeneity." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0392.

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Les systèmes de génétique inverse permettent de manipuler les génomes viraux et se sont révélés essentiels pour étudier les virus à ARN. Récemment, une méthode basée sur la PCR, la méthode ISA (Infectious Subgenomic Amplicons), a été développée. La première partie de cette thèse se concentre sur la simplification de la méthode ISA. La principale contrainte d'ISA est l'exigence de produire des fragments génomiques modifiés qui nécessite un promoteur de transcription à l’extrémité 5’ du premier fragment et un ribozyme du virus de l'hépatite delta, suivi du signal de polyadénylation du virus simi

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Farias, Guilherme José. "Avaliação de progênies F2:4 de uma população de soja e perspectivas de melhoramento." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-10022009-103719/.

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Os objetivos do presente trabalho compreenderam a obtenção de estimativas de parâmetros genéticos e fenotípicos, como variâncias, correlações, herdabilidades e respostas à seleção, em uma população derivada do cruzamento entre as linhagens 14 e 56 de soja, contrastantes para produção de grãos. Os tratamentos consistiram de uma amostra de 89 progênies F2:4 e 11 testemunhas comerciais, que foram avaliadas em experimentos em látice triplo 10 x 10 no ano agrícola 2007/08 na Estação Experimental Anhembi do Departamento de Genética da ESALQ/USP, localizada em Piracicaba, SP. A parcela experimental f

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Silveira, Guilherme Augusto da. "Influência de fatores espaciais e ambientais na estrutura da comunidade de invertebrados em nascentes tropicais." Universidade Federal de Juiz de Fora (UFJF), 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/2331.

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Pastina, Maria Marta. "Mapeamento de QTLs e estudo da interação entre QTLs, ambientes e cortes em cana-de-açúcar, usando a abordagem de modelos mistos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-08112010-153342/.

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Os programas de melhoramento da cana-de-açúcar demandam aproximadamente 12 anos para a obtenção de um novo cultivar. Assim, os marcadores moleculares podem ser usados como uma ferramenta valiosa, uma vez que possibilitamo estudo da arquitetura genética de caracteres quantitativos, ajudando a reduzir este tempo. Embora a cana-de-açúcar seja uma cultura perene, para a qual o desempenho genotípico é avaliado através de ensaios estabelecidos ao longo de diferentes locais e cortes, a maior parte dos estudos de mapeamento de QTLs ignora a existência de interação entre QTLs, corte e local (QTL × H ×

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Lee, Cheng-Ruei. "The Maintenance of Genetic Variation by Environmental Selection." Diss., 2013. http://hdl.handle.net/10161/8238.

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<p>Understanding forces creating or maintaining the vast amount of biodiversity 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 genetic drift or selective sweep, and maintained by balancing selection that favors different alleles in different environments or time. In my dissertation, I will address how spatially heterogeneous environmental selection maintains

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Sharpe, Cameron Saunders. "Genetic and environmental variation in stress physiology among steelhead trout (Oncorhynchus mykiss)." Thesis, 1992. http://hdl.handle.net/1957/36144.

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Nawaz, Mohammad 1957. "Genetic and environmental variation in production components of purebred and crossbred ewes." Thesis, 1990. http://hdl.handle.net/1957/37512.

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Coopworth sheep, a newly available genotype, were compared with other genotypes in two trials to assess cumulative lamb and wool production and contributing components related to survival, reproduction and growth, and for the effects of ewe body weight on reproductive traits. In a third trial, various genotypes generated in the process of upgrading native Kaghani sheep, were evaluated for lamb and wool production. In the first two trials six ewe genotypes, generated by mating Coopworth (C), Polypay (P) and Suffolk (S) rams to Polypay and Coopworth-type ewes, were exposed to Hampshire rams for

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Balduman, Lisa M. "Variation in adaptive traits of coastal Douglas-fir : genetic and environmental components /." 1995. http://hdl.handle.net/1957/13626.

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Idaghdour, Youssef. "Genetic and environmental components of human leukocyte gene expression variation in Morocco." 2009. http://www.lib.ncsu.edu/theses/available/etd-06152009-021927/unrestricted/etd.pdf.

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Sureshkumar, Sridevi [Verfasser]. "Genetic and environmental modulation of phenotypic variation in Arabidopsis thaliana / vorgelegt von Sridevi Sureshkumar." 2011. http://d-nb.info/1010152009/34.

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Tsai, Yu-Lung, and 蔡幼龍. "The relationships of expansion route and environmental factors with genetic variation of Solenopsis invicta." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/r45e4h.

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碩士<br>國立中興大學<br>昆蟲學系所<br>101<br>Invasive species are highly aggressive, and negatively effect on human economies and biodiversity. Successful biological invasions usually result from several evolutionary events that improve a species ability to survive in new habitats. The aim of this study is to quantify the roles of expansion route and environmental factors in the genetic variation of red import fire ant (Solenopsis invicta) in 16 cities of China by a novel analysis. We based on 211 S. invicta microsatellite data with 53 loci, and used Bayesian inference to calculate dissimilarity of environ

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Nguyen, Tran Nguyen. "Lignin biosynthesis in wheat biomass and its response to genetic and environmental variations." 2015. http://hdl.handle.net/1993/30313.

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Production of bioethanol from crop residues such as wheat straw, has been considered as a viable approach to meet the ever increasing demands for energy without affecting our environment. However, lignin hinders the success of efficient production of bioethanol as it confers recalcitrance of lignocellulosic biomass to hydrolysis. Genetic modification of plant biomass lignin content or composition without affecting its agronomic functions, can reduce biomass recalcitrance, however, application of this strategy requires a detailed understanding of the molecular mechanisms underlying lignin synth

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Hershberger, Amanda Jannette. "Genetic and environmental variation in Vitex and cost analysis of a woody ornamental breeding program." 2008. http://purl.galileo.usg.edu/uga%5Fetd/hershberger%5Famanda%5Fj%5F200812%5Fms.

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Pregitzer, Clara Christina. "Plant genotype and environment interact to influence soil carbon and nitrogen dynamics." 2010. http://trace.tennessee.edu/utk_gradthes/654.

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Carvalho, João Luís Oliveira. "The role of environmental variation, size-selective harvesting and diseases on the life-history traits of Iberian ibex." Doctoral thesis, 2019. http://hdl.handle.net/10773/29243.

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Size-selective harvesting (e.g. trophy hunting) involves removing specific individuals that exhibit desirable phenotypes. The ecological and evolutionary consequences of selective harvesting are controversial because it remains unclear how environmental conditions dilute or strengthen the effects of this activity. In Spain, the trophy hunting of male Iberian ibexes (Capra pyrenaica Schinz, 1838), associated with the ongoing environmental changes of the Mediterranean basin, may have undesirable consequences on the phenotypic traits and population dynamics of this species. By analysing a compreh

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