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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,...
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.
Phylogenetic Trees03:21

Phylogenetic Trees

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.
Phylogeny01:23

Phylogeny

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 kingdom.
Evolutionary Relationships through Genome Comparisons02:54

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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...
The Tree of Life - Bacteria, Archaea, Eukaryotes02:40

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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both extant and...

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Updated: May 29, 2026

A Practical Guide to Phylogenetics for Nonexperts
12:00

A Practical Guide to Phylogenetics for Nonexperts

Published on: February 5, 2014

Tree models for macroevolution and phylogenetic analysis.

Graham R Jones1

  • 1Balnakeil, Durness, Lairg, UK. art@gjones.name

Systematic Biology
|August 26, 2011
PubMed
Summary
This summary is machine-generated.

Phylogenetic tree imbalance is more pronounced than predicted by simple models. Several models accurately replicate real-world tree imbalance, offering insights into evolutionary processes and sampling biases.

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Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Computational Biology

Background:

  • Phylogenetic trees often exhibit greater imbalance than predicted by the standard Yule process.
  • Previous studies quantified this imbalance using datasets like TreeBASE.
  • Understanding tree imbalance is crucial for accurate evolutionary inference.

Purpose of the Study:

  • To conduct a more precise analysis of phylogenetic tree imbalance.
  • To compare simulated trees from various models with empirical trees from datasets.
  • To develop and investigate statistics for measuring and distinguishing tree balance.

Main Methods:

  • Simulated phylogenetic trees under a range of evolutionary models.
  • Compared simulated trees with empirical trees from TreeBASE and two smaller datasets.
  • Developed and applied statistics to measure tree balance and variance.

Main Results:

  • Several simple models successfully matched the degree of imbalance observed in real phylogenetic trees.
  • These models also remarkably matched the variance of imbalance among empirical trees.
  • Age-dependent (Bellman-Harris) branching processes were studied in detail.

Conclusions:

  • It remains challenging to disentangle macroevolutionary processes from sampling biases.
  • The findings suggest that certain simple models can adequately represent phylogenetic tree imbalance.
  • The use of a uniform prior on tree topologies in Bayesian phylogenetic analysis is not recommended.