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Related Concept Videos

Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Bacterial Transcription01:53

Bacterial Transcription

RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Eukaryotic Evolution01:24

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Evolution of Microbial Genome01:08

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.

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Related Experiment Video

Updated: Jun 21, 2026

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
09:04

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis

Published on: July 26, 2018

The evolution of the Three Rs.

Sebastien Farnaud1

  • 1Dr Hadwen Trust for Humane Research, Hitchin, Herts, UK. sebastien.farnaud@drhadwentrust.org

Alternatives to Laboratory Animals : ATLA
|August 15, 2009
PubMed
Summary

The Three Rs concept, celebrating 50 years, promotes ethical science by replacing animal models. Advances in humane experimental techniques align with Darwinian principles for a more moral and efficient scientific future.

Area of Science:

  • Ethical science
  • Animal welfare in research
  • History of scientific methodology

Background:

  • The 50th anniversary of The Principles of Humane Experimental Technique by Russell and Burch coincides with Darwinian anniversaries.
  • Analogies exist between Darwin's work and the Three Rs concept, highlighting shared principles.

Purpose of the Study:

  • To commemorate the 50th anniversary of the Three Rs concept.
  • To draw parallels between Darwin's theories and ethical experimental practices.
  • To highlight advancements in replacing animal models in scientific research.

Main Methods:

  • Historical analysis of scientific publications.
  • Conceptual comparison of Darwinian evolution and the Three Rs.
  • Review of technological advancements in experimental techniques.

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Related Experiment Videos

Last Updated: Jun 21, 2026

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
09:04

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Published on: July 26, 2018

Use of a Video Scoring Anchor for Rapid Serial Assessment of Social Communication in Toddlers
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Use of a Video Scoring Anchor for Rapid Serial Assessment of Social Communication in Toddlers

Published on: March 14, 2018

Transition of Farm Pigs to Research Pigs using a Designated Checklist followed by Initiation of Clicker Training - a Refinement Initiative
07:59

Transition of Farm Pigs to Research Pigs using a Designated Checklist followed by Initiation of Clicker Training - a Refinement Initiative

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Main Results:

  • The Three Rs concept has evolved significantly over 50 years.
  • Technological progress is making Replacement of animal models increasingly feasible.
  • Modern science is moving towards more ethical and efficient practices.

Conclusions:

  • The Three Rs concept represents a significant ethical advancement in science.
  • Continued progress in humane experimental techniques, driven by technology, aligns with the spirit of Darwin and Russell.
  • The ultimate goal of 'Replacement' may redefine the core principles of ethical experimentation.