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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...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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.
In contrast, regions which code...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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.
In contrast, regions which code...
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.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

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.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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Related Experiment Video

Updated: Jul 10, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

Phylogenetic networks based on the molecular clock hypothesis.

Sergey Bereg, Yuanyi Zhang

    IEEE/ACM Transactions on Computational Biology and Bioinformatics
    |November 3, 2007
    PubMed
    Summary

    Phylogenetic networks, under the molecular clock hypothesis, are explored for their distance matrices. New characterizations for 3 and 4 taxa and network construction algorithms are presented.

    Area of Science:

    • Computational Biology
    • Evolutionary Biology
    • Bioinformatics

    Background:

    • Phylogenetic trees require ultrametric distance matrices for the molecular clock hypothesis.
    • The ultrametric condition is highly restrictive for real biological data.

    Purpose of the Study:

    • To investigate phylogenetic networks compatible with the molecular clock hypothesis.
    • To characterize distance matrices that admit such networks for small numbers of taxa.
    • To develop algorithms for constructing these networks with optimized fit.

    Main Methods:

    • Characterization of distance matrices for 3 and 4 taxa under the molecular clock hypothesis.
    • Development of two least-squares optimization algorithms for network construction.

    More Related Videos

    A Practical Guide to Phylogenetics for Nonexperts
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    A Practical Guide to Phylogenetics for Nonexperts

    Published on: February 5, 2014

    A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
    10:23

    A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

    Published on: July 11, 2025

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    Last Updated: Jul 10, 2026

    Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
    08:57

    Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

    Published on: August 14, 2018

    A Practical Guide to Phylogenetics for Nonexperts
    12:00

    A Practical Guide to Phylogenetics for Nonexperts

    Published on: February 5, 2014

    A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
    10:23

    A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

    Published on: July 11, 2025

    Main Results:

    • Identified specific conditions on distance matrices that allow for the construction of phylogenetic networks adhering to the molecular clock hypothesis for 3 and 4 taxa.
    • Proposed algorithms provide a method for constructing networks that best fit the data.

    Conclusions:

    • Phylogenetic networks offer a more flexible framework than trees for incorporating the molecular clock hypothesis.
    • The characterizations and algorithms advance the study of evolutionary relationships with time-calibrated data.