Sökning: "dimorphism"
Visar resultat 1 - 5 av 49 avhandlingar innehållade ordet dimorphism.
1. The genetic architecture of sexual dimorphism
Sammanfattning : 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. LÄS MER
2. The evolution of sexual dimorphism and its genetic underpinnings
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
3. Avian Genome Evolution - Gene Expression, Gene Divergence and Sexual Dimorphism
Sammanfattning : 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. LÄS MER
4. On the endemic Fucus radicans in the Baltic Sea
Sammanfattning : 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. LÄS MER
5. Defence on Demand : A physiological perspective on phenotypic plasticity in anti-predator traits
Sammanfattning : 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. LÄS MER