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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...
What is Natural Selection?01:32

What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.The Theory of Natural...
Evolutionary Processes in Microbes01:26

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
The Evidence for Evolution02:55

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Natural Selection and Adaptation01:15

Natural Selection and Adaptation

Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
Beyond physical adaptations, psychological...

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Updated: Jun 6, 2026

Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Darwin, microbes and evolution by natural selection.

E Richard Moxon1

  • 1Paediatrics, Medical Sciences Division, John Radcliffe Hospital, Oxford, UK. richard.moxon@paediatrics.ox.ac.uk

Advances in Experimental Medicine and Biology
|December 2, 2010
PubMed
Summary
This summary is machine-generated.

Microbes, though overlooked by Darwin, exemplify evolutionary principles. Studying these ancient organisms reveals crucial insights into host interactions and resistance, essential for modern biology.

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Last Updated: Jun 6, 2026

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Area of Science:

  • Evolutionary Biology
  • Microbiology

Background:

  • Charles Darwin's theory of evolution focused on recent life forms, largely omitting ancient microbial life.
  • The germ theory of disease emerged after Darwin's seminal work, highlighting the significance of microorganisms.

Observation:

  • Microbes, including bacteria, viruses, and fungi, represent the earliest life on Earth, originating nearly 4 billion years ago.
  • Despite their ancient origins, microbes were scarcely mentioned in Darwin's writings, though contemporaries like Louis Pasteur pioneered bacteriology.

Findings:

  • Microorganisms serve as powerful model systems for understanding core Darwinian selection principles.
  • Studying microbial evolution is key to understanding host-pathogen dynamics and the development of resistance.

Implications:

  • Microbial insights are vital for addressing challenges in infectious disease, drug resistance, and vaccine development.
  • Integrating microbial evolution into Darwinian frameworks offers a more complete understanding of life's history and adaptation.