Sökning: "maternal selection"

Visar resultat 16 - 20 av 45 avhandlingar innehållade orden maternal selection.

  1. 16. Genome Divergence in Progress - a population genetic analysis of the allopolyploid Arabidopsis suecica and its maternal parent A. thaliana

    Författare :Mattias Jakobsson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cytogenetik; Genetik; cytogenetics; Genetics; sequence polymorphism; microsatellites; population structure; polyploidy; single origin; Arabidopsis thaliana; Arabidopsis suecica; genome evolution; evolutionary history; Plant genetics; Växtgenetik;

    Sammanfattning : The evolutionary history of the allotetraploid Arabidopsis suecica and its maternal parent Arabidopsis thaliana is analyzed in the thesis in terms of genetic variation in the natural populations of the two species. The earliest phase of the speciation event in which the genomes of A. thaliana and A. LÄS MER

  3. 17. Immune dysregulation in early life and risk of autism

    Författare :Martin Brynge; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Background The notion of immune perturbations in autism is in part based on numerous observations of an association between maternal infections in general during pregnancy and autism in the child, and on observations of immune abnormalities in individuals diagnosed with autism. Maternal infections during pregnancy are linked to autism in several epidemiological studies, although genetic/familial confounding has rarely been considered. LÄS MER

  4. 18. Genetic variation and phenotypic plasticity in body traits of nestling blue tits

    Författare :Camilla Kunz; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; populationsbiologi; Population Biology;

    Sammanfattning : This thesis examines genetic and environmental contributions to variation in body traits in a population of free-living blue tits. It also investigates possible consequences for the evolution of body size. LÄS MER

  5. 19. Genetics of sow performance in piglet production

    Författare :Helena Lundgren; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : The aim of this thesis was to provide knowledge about the genetic relationships concerning sow performance in piglet production. During the last decades, selection in dam lines has focused on increasing litter size and piglet growth. Consequently, the demand on the sow to provide her piglets with enough milk increases. LÄS MER

  7. 20. Factors associated with having the first baby at an advanced age

    Författare :Anne Britt Vika Nilsen; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Postponing parenthood;

    Sammanfattning : The aims of this thesis were to investigate characteristics of women and men who have their first baby at an advanced age, reasons for postponing childbirth, and consequences in terms of adverse pregnancy outcomes. Maternal age at first birth has increased in many modern societies; in both Sweden and Norway, first-time mothers are now about five years older, compared with the previous generation. LÄS MER