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Related Concept Videos

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...
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,...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
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...
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.

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Related Experiment Video

Updated: Jun 9, 2026

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources
15:28

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources

Published on: September 3, 2009

Resolving postglacial phylogeography using high-throughput sequencing.

Kevin J Emerson1, Clayton R Merz, Julian M Catchen

  • 1Center for Ecology and Evolutionary Biology, University of Oregon, Eugene, OR 97403-5289, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 28, 2010
PubMed
Summary
This summary is machine-generated.

Researchers used restriction site-associated DNA tags (RAD tags) to uncover genetic structure in the pitcher plant mosquito. This method reveals evolutionary history in nonmodel organisms, aiding phylogeography and speciation studies.

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Novel Sequence Discovery by Subtractive Genomics
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Last Updated: Jun 9, 2026

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources
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Published on: September 3, 2009

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Novel Sequence Discovery by Subtractive Genomics
09:40

Novel Sequence Discovery by Subtractive Genomics

Published on: January 25, 2019

Area of Science:

  • Evolutionary Biology
  • Genomics
  • Ecology

Background:

  • The line between model and nonmodel organisms is blurring in biological research.
  • High-throughput sequencing is increasingly applied to diverse species based on unique traits, not just genetic data availability.

Purpose of the Study:

  • To demonstrate a low-cost, efficient technique for fine-scale phylogenetic analysis in recently diverged populations.
  • To investigate the genetic structure and evolutionary direction in the pitcher plant mosquito (Wyeomyia smithii).

Main Methods:

  • Application of restriction site-associated DNA tags (RAD tags) for genetic analysis.
  • Phylogenetic analysis of Wyeomyia smithii populations from a southern Appalachian Mountain refugium.

Main Results:

  • Unresolved genetic structure and evolutionary direction were revealed using RAD tags.
  • Detailed phylogeographic patterns were identified in Wyeomyia smithii populations.

Conclusions:

  • The RAD tag method is effective for studying phylogeography in any organism, irrespective of genomic data.
  • This technique can identify incipient speciation and genome-wide variation in natural populations.