Sökning: "additive genetic variance"

Visar resultat 1 - 5 av 17 avhandlingar innehållade orden additive genetic variance.

1. 1. Population differentiation in Lythrum salicaria along a latitudinal gradient

   Författare :Katarina Olsson; Jon Ågren; Susan Kalisz; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; additive genetic variance; clinal variation; evolutionary constraints; G matrix; genetic correlation; natural selection; pollen limitation; population differentiation; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; ekologisk botanik; Ecological Botany;

   Sammanfattning : In this thesis, quantitative genetic approaches, common-garden experiments, and field studies were combined to examine patterns of population differentiation and the genetic architecture of characters of putative adaptive significance in the widely distributed perennial herb Lythrum salicaria. In this work, I (1) documented patterns of population differentiation in phenology, life-history, and morphology along latitudinal gradients at different geographical scales, (2) investigated the genetic architecture of phenology, flower morphology, and inflorescence size, and (3) combined estimates of phenotypic selection in the field with information on the genetic variance-covariance matrix (G) to examine potential constraints to adaptive evolution. LÄS MER

3. 2. The evolution of sexual dimorphism and its genetic underpinnings

   Författare :Philipp Kaufmann; Elina Immonen; Tim Connallon; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Sexual conflict; sex-specific dominance; maintenance of genetic variance; sexual antagonism; sex chromosomes; Y haplotypes; artificial selection; sexual dimorphism; Callosobruchus maculatus; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

   Sammanfattning : Sexual dimorphism often constitutes the largest phenotypic variance within species but it is puzzling how sexual dimorphisms evolve because most of the genome is shared between the sexes. Sexually antagonistic (SA) selection on a shared genome sets the stage for intralocus sexual conflict. LÄS MER

4. 3. Complex Trait Genetics : Beyond Additivity

   Författare :Simon Forsberg; Örjan Carlborg; Julien Ayroles; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; genetic interactions; epistasis; additivity; GWAS; vGWAS; Genetic mapping; yeast; Arabidopsis Thaliana; dog; Genetik; Genetics;

   Sammanfattning : The link between the genotype and the phenotype of an organism is immensely complex. Despite this it can, to a great extent, be captured using models that assume that gene variants combine their effects in an additive manner. This thesis explores aspects of genetics that cannot be fully captured using such additive models. LÄS MER

5. 4. Quantitative Trait Evolution in a Changing Environment in a Seed Beetle

   Författare :Lára R. Hallsson; Mats Björklund; Derek A. Roff; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quantitative trait; genetic variance; environmental change; temperature; seed beetle; sexual dimorphism; plasticity; inheritance; Animal Ecology; Zooekologi;

   Sammanfattning : During the last decades the climate has been changing more rapidly than in the preceding periods. This is for instance characterized by an increase in temperature. Interestingly, such changes in the environment are not necessarily constant over time as they often show high levels of fluctuation. LÄS MER

7. 5. Genetic studies of depressive symptoms

   Författare :Mårten Jansson; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Depressive Symptoms; Twin; Heritability; Serotonin receptor 2A; Serotonin transporter; MAOA; MAOB; Thrombocyte MAO activity; Linkage Disequilibrium.;

   Sammanfattning : This thesis is focused on depressive symptoms particularly in late fife. Depressive symptoms are associated with serious negative outcomes a greater level of disability and with excess morbidity and mortality. LÄS MER