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Related Concept Videos

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

The Tree of Life - Bacteria, Archaea, Eukaryotes

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...
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...
Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...

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Updated: Jun 5, 2026

A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles
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Molecules remodel the mammalian tree.

W W de Jong1

  • 1Dept of Biochemistry, University of Nijmegen, PO Box 9101, 6500 HB Nijmegen, and the Institute for Systematics and Population Biology, University of Amsterdam, 1090GT Amsterdam, The Netherlands.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
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DNA analysis is revolutionizing our understanding of mammalian evolution. New phylogenetic insights are reshaping the mammalian family tree, revealing unexpected relationships between diverse species.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • DNA sequences offer a rich source of phylogenetic information for tracing species genealogy.
  • Mammalian evolution is a well-studied area, making it a prime candidate for molecular phylogeny advancements.

Purpose of the Study:

  • To explore the application of DNA sequence data in understanding mammalian evolutionary history.
  • To highlight recent significant revisions in the phylogenetic tree of mammalian orders.

Main Methods:

  • Analysis of DNA sequences from extant species.
  • Comparative phylogenetic analysis.

Main Results:

  • Emerging molecular phylogeny data are significantly altering established views of mammalian relationships.
  • Unexpected groupings include whales with hippos and African golden moles with elephants, challenging traditional insectivore classifications.

Conclusions:

  • Molecular phylogeny is rapidly advancing, providing novel perspectives on mammalian evolutionary pathways.
  • Current research necessitates a re-evaluation of mammalian order classifications based on genetic evidence.