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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
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

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...
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...

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Related Experiment Video

Updated: Jun 5, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

Reconstructing shifts in diversification rates on phylogenetic trees.

M J Sanderson1, M J Donoghue

  • 1Section of Evolution and Ecology, University of California, Davis, CA 95616, USA.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary

Evolutionary rates and key innovations remain debated. While time-based methods dominated, newer tree-based approaches incorporate time secondarily, enhancing hypothesis testing power for evolutionary shifts.

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Last Updated: Jun 5, 2026

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Area of Science:

  • Evolutionary Biology
  • Paleontology
  • Molecular Evolution

Background:

  • Controversy surrounds the link between speciation/extinction rates and key evolutionary innovations.
  • Historically, 'time-based' methods using fossil data dominated this discussion.
  • Recently, 'tree-based' methods, often incorporating molecular data for time, have gained prominence.

Purpose of the Study:

  • To evaluate the relationship between evolutionary rates and the origin of key innovations.
  • To compare the efficacy of time-based versus tree-based methods in testing evolutionary hypotheses.
  • To emphasize the importance of incorporating temporal information in phylogenetic analyses.

Main Methods:

  • Utilizing phylogenetic relationship data.
  • Employing both traditional time-based (fossil record) and recent tree-based methods.
  • Incorporating molecular data to estimate time secondarily in tree-based analyses.

Main Results:

  • Hypothesis testing regarding key innovations requires phylogenetic information.
  • Some tests can be performed without explicit time data.
  • Including temporal information significantly increases the statistical power of these tests.

Conclusions:

  • The debate on evolutionary rates and key innovations is ongoing.
  • Tree-based methods offer a complementary approach to time-based methods.
  • Accurate temporal data is crucial for robustly testing hypotheses about evolutionary innovation and rate shifts.