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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

43.0K
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.
43.0K
What is Evolutionary History?02:35

What is Evolutionary History?

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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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Eukaryotic Evolution01:24

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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...
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Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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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...
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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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: Jul 24, 2025

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

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Conceptual and empirical bridges between micro- and macroevolution.

Jonathan Rolland1, L Francisco Henao-Diaz2,3, Michael Doebeli4

  • 1CNRS, UMR5174, Laboratoire Evolution et Diversité Biologique, Université Toulouse 3 Paul Sabatier, Toulouse, France. jonathan.rolland@univ-tlse3.fr.

Nature Ecology & Evolution
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Summary
This summary is machine-generated.

Bridging microevolution and macroevolution is key to understanding biodiversity. Future research can link small-scale evolutionary mechanisms to large-scale patterns like speciation and extinction.

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Area of Science:

  • Evolutionary Biology
  • Biodiversity Science
  • Genetics

Background:

  • Explaining biodiversity patterns requires a unifying framework across evolutionary scales.
  • Reconciling microevolutionary and macroevolutionary processes remains a significant challenge.

Purpose of the Study:

  • To identify critical links between microevolutionary and macroevolutionary processes.
  • To propose research avenues for building conceptual bridges between different evolutionary scales.

Main Methods:

  • Reviewing major questions in evolutionary biology requiring micro-macro links.
  • Examining how microevolutionary mechanisms (drift, mutation, selection, migration) translate to macroevolutionary processes (speciation, extinction, dispersal).
  • Proposing improvements to comparative methods for inferring molecular, phenotypic, and species evolution.

Main Results:

  • Four major questions in evolutionary biology necessitate conceptual bridges between micro and macroevolution.
  • Potential research pathways exist to link mechanisms across evolutionary scales.
  • Current comparative methods can be enhanced to address these cross-scale questions.

Conclusions:

  • A synthesis to understand microevolutionary dynamics over long timescales is achievable.
  • Connecting micro and macroevolution is crucial for a comprehensive understanding of biodiversity.
  • Future research should focus on establishing clear links between evolutionary mechanisms at different scales.