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Related Concept Videos

Microbial Phylogeny01:28

Microbial Phylogeny

Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Phylogeny01:23

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire...
Phylogenetic Trees03:21

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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
Phylogenetic Trees03:21

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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Updated: Jul 4, 2026

A Practical Guide to Phylogenetics for Nonexperts
12:00

A Practical Guide to Phylogenetics for Nonexperts

Published on: February 5, 2014

Phylogenetic model evaluation.

Lars Sommer Jermiin1, Vivek Jayaswal, Faisal Ababneh

  • 1School of Mathematics and Statistics, Sydney Bioinformatics and Centre for Mathematical Biology, University of Sydney, Sydney, New South Wales, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|June 21, 2008
PubMed
Summary
This summary is machine-generated.

Phylogenetic analyses rely on Markov models, but their selection and evaluation methods have limitations. Understanding these shortcomings is crucial for accurate evolutionary rate approximations.

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Last Updated: Jul 4, 2026

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Area of Science:

  • Evolutionary biology
  • Bioinformatics
  • Computational biology

Background:

  • Phylogenetic methods commonly use model-based approaches, relying on Markov models to estimate evolutionary rates.
  • Accurate model selection is assumed to reflect the evolutionary processes that generated the sequence data.

Purpose of the Study:

  • To review the critical issue of Markov model selection and evaluation in phylogenetic analysis.
  • To highlight the potential shortcomings of current model-selection methods.

Main Methods:

  • Review of existing literature on Markov models in phylogenetics.
  • Discussion of methods for estimating Markov model fit.
  • Analysis of common practices in model selection.

Main Results:

  • A variety of methods exist for estimating Markov model fit and selecting appropriate models.
  • Investigators sometimes overlook the inherent limitations of these model-selection techniques.
  • The chapter emphasizes the need for careful consideration of model evaluation.

Conclusions:

  • Model-based phylogenetic methods require rigorous evaluation of Markov model approximations.
  • Awareness of model-selection limitations is essential for reliable phylogenetic inference.
  • Further research may be needed to refine model evaluation strategies.