Sökning: "crosses"

Visar resultat 21 - 25 av 96 avhandlingar innehållade ordet crosses.

  1. 21. Linkage maps in studies of genetic variation - examples from Beta vulgaris

    Författare :Thomas Kraft; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cytogenetics; Genetics; Beta vulgaris; Linkage maps; genetic variation; Genetik; cytogenetik;

    Sammanfattning : Today, most studies of genetic variation utilise molecular markers, making it possible to detect variation at the DNA level. This has greatly facilitated studies of genetic variation in population and evolutionary genetics, systematics and transmission genetics. LÄS MER

  3. 22. Performance of dairy cows and calves in agro-pastoral production systems

    Författare :Christina Johansson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Seasonal changes in pasture quality and quantity and cattle management routines were examined on 10 farms in southwest Uganda in order to evaluate how these factors affected milk yield, live weight and body condition in cows and daily weight gain in calves in agro-pastoral production systems in a semi-arid environment. Mean available herbage mass ranged between 0. LÄS MER

  4. 23. Extensions of the Reed-Frost process

    Författare :Gianpaolo Scalia-Tomba; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The Reed-Frost process is a discrete time stochastic model for the spread of an infectious disease in a homogeneous population. In this work, extensions of the basic model are investigated. LÄS MER

  5. 24. Development of Variance Component Methods for Genetic Dissection of Complex Traits

    Författare :Francois Besnier; Örjan Calborg; Miguel Perez-Enciso; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bioinformatics; Bioinformatik; Genetik; Genetics;

    Sammanfattning : This thesis presents several developments on Variance component (VC) approach for Quantitative Trait Locus (QTL) mapping. The first part consists of methodological improvements: a new fast and efficient method for estimating IBD matrices, have been developed. LÄS MER

  7. 25. Hopeful monsters: The role of hybrids in adaptation : The impact of hybridisation and genetic diversity on adaptation to stressful and novel environments

    Författare :Ciaran Gilchrist; Rike Stelkens; Christopher Wheat; Linda Laikre; Mathilde Cordellier; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Experimental evolution; Saccharomyces cerevisiae; population genetics; hybridisation; adaptation; aneuploidy; comparative genomics; evolve-and-resequence; de novo mutations; evolutionary parallelism; populationsgenetik; Population Genetics;

    Sammanfattning : Adaptation to novel environments can only occur if natural selection has the raw material to act upon. But small, endangered populations are often genetically depleted, and the acquisition of beneficial de novo mutations often takes too long when population face quick and extreme environmental change. LÄS MER