Sökning: "Populationsgenetik"

Visar resultat 1 - 5 av 6 uppsatser innehållade ordet Populationsgenetik.

  1. 1. Beyond high mutation highrecombination limit in statisticalgenetics

    Master-uppsats, KTH/Fysik

    Författare :Luc Zorrilla; [2021]
    Nyckelord :Statistical Genetics; Population genetics; Statistical physics; Linkage Equilibrium;

    Sammanfattning : One considers the bi-allelic model in population genetics which describes a population of genomes evolving under the processes of selection, mutation, recombination and drift. A focus is made on the Quasi-Linkage Equilibrium (QLE) phase with recent derivations from Neher and Shraiman, which exists for fast recombinations compared to selection strength and whose dynamics is greatly simplified compared to the general case. LÄS MER

  3. 2. Developing new methods for estimating population divergence times from sequence data

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för medicinsk biokemi och mikrobiologi

    Författare :Karl Svärd; [2021]
    Nyckelord :genetics; evolution; bioinformatics; migration; demography; beta distributions; population genetics; numerical methods; simulations; genetik; evolution; bioinformatik; migration; demografi; betafördelning; populationsgenetik; numeriska metoder; simulationer;

    Sammanfattning : Methods for estimating past demographic events of populations are powerful tools in order to get insights of otherwise hidden pasts. The genetic data of people is a valuable resource for these purposes as patterns of variation can inform of the past evolutionary forces and historical events that generated them. LÄS MER

  4. 3. Provtagningsdesign för en populationsgenetisk studie av violgubbe

    Kandidat-uppsats, Högskolan i Halmstad

    Författare :Ida Johansson; [2021]
    Nyckelord :populationsstudie; populationsgenetik; mykologi; GIS; bevarandebiologi; naturvård; hotade arter; svampar; studiedesign;

    Sammanfattning : Population studies have become important tools in conservation biology and genetic analyses are used to investigate genetic diversity within and among populations. Genetic variation can help improve fitness and ecological resilience. However, knowledge about genetic diversity is scarce for most wild species in Sweden. LÄS MER

  5. 4. Mean and variance of absorption time in a population genetics model: Comparison between Markov chain and diffusion process methods.

    Master-uppsats, Lunds universitet/Matematik (naturvetenskapliga fakulteten)

    Författare :Alexander Koronen; [2019]
    Nyckelord :Population genetics; Markov chain; Diffusion process.; Mathematics and Statistics;

    Sammanfattning : Finding the expected number of generations it takes before every individual in a population (of constant size) only has one type of gene at a particular locus of a chromosome, can be formulated as computing the mean absorption time in a Markov chain. However, the Markov chain approach is inappropriate when the population is large. LÄS MER

  7. 5. Konsekvenser av inavel under många generationer : populationsgenetiska mekanismer

    Kandidat-uppsats, SLU/Dept. of Biosystems and Technology (from 130101)

    Författare :Carita Johansson; [2017]
    Nyckelord :inavel; inavelsdepression; purging; fitness; alleler; generationer; flaskhals; selektion; återhämtning; populationsgenetik;

    Sammanfattning : Inavel innebär att individer som är nära släkt får avkomma tillsammans. Om det pågår under många generationer påverkas förloppet av flera olika mekanismer. Inaveln i sig gör att den genetiska variationen i populationen minskar och blir likartad. LÄS MER