Sökning: "sexual antagonism"
Visar resultat 1 - 5 av 10 avhandlingar innehållade orden sexual antagonism.
1. 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
2. Genomic studies of sex differences : On mutations, recombination, and sexual antagonism in songbirds
Sammanfattning : Many organisms have separate sexes, i.e., males and females. The presence of separate sexes causes sex-specific selection regimes and sexual antagonism, which can lead to sex differences in morphology, physiology, and behaviours. LÄS MER
3. Sexual conflict and selection on pistil and pollen traits
Sammanfattning : The incidence of sexual selection in plants is today acknowledged, however, just as in animals, evolution and maintenance of mate choice is gravely underexplored. Moreover, the potential for sexual conflicts to occur in plants has only been assessed empirically to a very limited degree. LÄS MER
4. Sex Chromosome Evolution in a Hermaphrodite : Genetic and phenotypic relationships between sex roles
Sammanfattning : Sex chromosome evolution in a hermaphrodite ancestor starts with the establishment of a sex-determining region (SDR). Over time, sex-specific genes, and/or sexually antagonistic alleles will become linked to the SDR. LÄS MER
5. OXYTOCIN AND VASOPRESSIN IN UTERINE ACTIVITY. Receptor-mediated agonism and antagonism with special regard to the aetiology and treatment of preterm labour and primary dysmenorrhoea
Sammanfattning : With a view to the aetiology and treatment of preterm labour and primary dysmenorrhoea we studied the influence of sexual steroids on the plasma levels of oxytocin and vasopressin, effect of these peptides on uterine contractility in vitro and in vivo, receptor concentrations and antagonists to oxytocin and vasopressin. In postmenopausal women oestrogen increased the concentrations in plasma of both peptides, whereas progesterone increased oxytocin but decreased vasopressin levels. LÄS MER