Search for dissertations about: "DIMORPHISM"

Showing result 1 - 5 of 48 swedish dissertations containing the word DIMORPHISM.

2. 1. The genetic architecture of sexual dimorphism

   Author : Robert Griffin; Urban Friberg; Alexei Maklakov; Jon Ågren; Russell Bonduriansky; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Drosophila melanogaster; evolution; intralocus sexual conflict; sex chromosomes; sexually antagonistic selection; sexual dimorphism;

   Abstract : Phenotypic differences between the sexes evolve largely because selection favours a different complement of traits in either sex. Theory suggests that, despite its frequency, sexual dimorphism should be generally constrained from evolving because the sexes share much of their genome. READ MORE

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

   Author : Philipp Kaufmann; Elina Immonen; Tim Connallon; Uppsala universitet; []
   Keywords : 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;

   Abstract : 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. READ MORE

5. 3. Avian Genome Evolution - Gene Expression, Gene Divergence and Sexual Dimorphism

   Author : Sara Naurin; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; sex chromosome; avian genome evolution; gene expression; sexual dimorphism; Z chromosome;

   Abstract : This study has focused on: (i) differences in how males and females use the genes in the genome, (ii) how sex chromosomes evolve and (iii) how the evolutionary rate of genes are affected by the chromosome on which they are located on and the gene expression level they experience. A large-scale microarray was developed for the zebra finch, Taeniopygia guttata and techniques were developed so that this microarray could also be used for wild passerine birds. READ MORE

6. 4. On the endemic Fucus radicans in the Baltic Sea

   Author : Ellen Schagerström; Lena Kautsky; Inga Kjersti Sjøtun; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; seaweed; sexual reproduction; clonality; fragmentation; dimorphism; salinity; distribution; Plant Ecology; växtekologi;

   Abstract : The brown macroalgae Fucus radicans is endemic to the Baltic Sea, but little is known about this newly described species. This thesis investigates the ecology and role of F. radicans within the species poor Baltic Sea ecosystem. The thallus of F. READ MORE

7. 5. Defence on Demand : A physiological perspective on phenotypic plasticity in anti-predator traits

   Author : Jerker Vinterstare; Enhet akvatisk ekologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Phenotypic plasticity; inducible defences; stress physiology; cortisol; immune function; trade-offs; sexual dimorphism; crucian carp; visual ecology; predator-prey interactions; POMC pro-opiomelanocortin ; colour change; eco-immunology; Anti-predator defences; Inducible morphological defence; Phenotypic plasticity; Stress physiology; Cortisol; Immune function; Crucian carp; Predator-prey interactions; Trade-offs; Sexual dimorphism; POMC; Pro-opiomelanocortin; Visual ecology; Eye evolution; Melanin; Eco-immunology; Pace-of-life; Behavioural plasticity;

   Abstract : Almost all species face some degree of predation risk, and, hence, evolution has produced a plethora of anti-predator defences. However, anti-predator strategies require resources, and the prevailing risk of becoming prey is influenced by many factors and rarely constant across time and space. READ MORE