Sökning: "genetic drift"

Visar resultat 1 - 5 av 17 uppsatser innehållade orden genetic drift.

  1. 1. Analysis of relatedness and genetic diversity in Swedish sheep breeds using medium density (50K) SNP data

    Master-uppsats, SLU/Dept. of Animal Breeding and Genetics

    Författare :Krishani Devika Wijesinghe Sinhalage; [2023]
    Nyckelord :sheep; genetic diversity; population structure; inbreeding; runs of homozygosity; coat colour; MC1R;

    Sammanfattning : The local Swedish sheep breeds belong to a group of sheep breeds known as North European short-tailed sheep breeds. Evaluation of genetic diversity, relatedness, and population structure of local breeds offers crucial metrics to prevent inbreeding depression, genetic erosion, and crossbreeding between locally adapted and exotic sheep breeds since these occurrences can have detrimental effects and ultimately lead to extinction. LÄS MER

  2. 2. Estimating the effective population size of Swedish native cattle : understanding the demographic trajectories of indigenous Swedish cattle breeds

    Master-uppsats, SLU/Dept. of Animal Breeding and Genetics

    Författare :Dolapo Adepoju; [2022]
    Nyckelord :Swedish native cattle; effective population size; genetic drift; cattle demographic trajectories; native cattle conservation;

    Sammanfattning : The indigenous cattle populations are on the decline globally with the continuous improvement of genetic gains in commercial breeds. Due to their unique adaptive features to the local ecosystem, traditional cattle breeds are pools of valuable genetic resources that could help combat the impact of climate change in the near future. LÄS MER

  3. 3. A population genomic approach to investigate potential island effects in the cryptic wood white butterfly (Leptidea juvernica) : Do island populations have lower genetic diversity and less efficient selection than mainland populations?

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Xuejing Hu; [2022]
    Nyckelord :island effect;

    Sammanfattning : Due to limited geographic ranges, island populations, in general, are expected to have smaller population sizes and a limited influx of migrants compared to populations inhabiting continental mainlands. Therefore, island populations are expected to be influenced by genetic drift and natural selection differently from mainland populations. LÄS MER

  4. 4. Who calls the African Wild Dog? : de novo SNP discovery and genotyping in the Lycaon pictus

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Mathilda Bertills; [2021]
    Nyckelord :snp; single nucleotide polymorphism; african wild dog; lycaon pictus; conservation;

    Sammanfattning : Large carnivores, especially the African wild dog, Lycaon pictus, are vulnerable to human-mediated changes and climate effects. As they are apex predators, they also affect lower trophic levels. Due to anthropogenic land-use changes affecting habitat, prey, and population densities, large carnivore populations are declining. LÄS MER

  5. 5. Valpsjukevirus – ytterligare ett hot mot den biologiska mångfalden?

    Kandidat-uppsats, SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Författare :Cecilia Norstedt; [2019]
    Nyckelord :Valpsjukevirus; valpsjuka; viltmedicin; bevarandebiologi; biologisk mångfald;

    Sammanfattning : De senaste 40 åren har man sett en drastisk minskning av den biologiska mångfalden och man beräknar att vilda djurpopulationer har minskat med 60 % sedan 1970. De största hoten mot den biologiska mångfalden anses vara förlust av habitat och överexploatering, men infektiösa sjukdomar finns listade bland de fem största hoten. LÄS MER