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Phylogeny

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.

Phylogenetic Trees

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.

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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...

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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,...

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Updated: Apr 3, 2026

A Practical Guide to Phylogenetics for Nonexperts

A Practical Guide to Phylogenetics for Nonexperts

Published on: February 5, 2014

Pyvolve: A Flexible Python Module for Simulating Sequences along Phylogenies.

Stephanie J Spielman¹, Claus O Wilke¹

¹Department of Integrative Biology, Center for Computational Biology and Bioinformatics, and Institute of Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX 78712, United States of America.

|September 24, 2015

Summary

This summary is machine-generated.

Pyvolve is a Python module for simulating genetic sequence evolution using Markov models. It offers flexibility for standard and custom evolutionary models, aiding bioinformatics research.

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Area of Science:

Computational Biology
Bioinformatics
Evolutionary Genetics

Background:

Simulating genetic data is crucial for phylogenetic analysis and evolutionary studies.
Existing tools may lack flexibility for custom evolutionary models.

Purpose of the Study:

Introduce Pyvolve, a Python module for simulating genetic sequences.
Provide a flexible framework for standard and custom evolutionary models.

Main Methods:

Utilizes continuous-time Markov models for sequence evolution.
Supports nucleotide, amino-acid, and codon sequence simulation.
Allows customization of model parameters, rate matrices, and states.

Main Results:

Pyvolve facilitates sequence simulation under diverse evolutionary scenarios.
Enables the development and testing of novel evolutionary models.
Offers a flexible and user-friendly Python-based solution.

Conclusions:

Pyvolve enhances phylogenetic and evolutionary modeling research.
Its flexibility supports a wide range of simulation needs.
The open-source module is readily available for the scientific community.