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This chapter introduces some of the methodologies used in estimating genetic distances, how we analyze them, and how we portray our results in a graphical fashion amenable for interpretation. Underlying most estimates of genetic distance are sets of geometric and/or evolutionary assumptions.
24 maj 2017 · In this simulation study, we analyze the behavior of different genetic distances in Island (null hypothesis) and stepping stone models displaying varying neighborhood sizes.
17 mar 2021 · A distance matrix has to satisfy additional properties in order to correspond to some weighted tree. In fact, there are two models that assume special constraints on the distance matrix: Ultrametric: For all triplets (a, b, c) of leaves, two pairs among them have equal distance, and the third distance is smaller; i.e. the triplet can be ...
29 lip 2011 · Given the Euclidean nature of the elementwise square root of phylogenetic distance matrices, the positive semidefinitiveness of the phylogenetic variance–covariance matrix of a trait following a BM model, or related models of trait evolution, can be established.
14 cze 2021 · We provide an unbiased estimate for the genetic similarity matrix of samples, conditioned on a phylogenetic tree.
A mutational model allows corrected distances. Jukes-Cantor model: D = 3 4 ln (1 4 3 Ds) D is the corrected distance (what we want) Dsis the raw count (what we have) ln is the natural log. Mutational models for DNA.
16 lut 2016 · Here we present a distance-based approach for inference about population structure using genetic data by defining population structure using network theory terminology and methods. A network is constructed from a pairwise genetic-similarity matrix of all sampled individuals.
