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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

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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.
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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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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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Genetic Drift03:33

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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Evolution in small steps and giant leaps.

Noah K Whiteman1,2

  • 1Department of Integrative Biology, University of California, Berkeley, California, 94720.

Evolution; International Journal of Organic Evolution
|January 18, 2022
PubMed
Summary
This summary is machine-generated.

Evolutionary biology explores interactions within and between organisms and their environments. Understanding these complex interactions, from genetic architecture to acquired toxicity, is key to deciphering adaptation and coevolutionary processes.

Keywords:
Adaptationcoevolutionevolutionary biologygenomesoligogenicomnigenic

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Ecology

Background:

  • Ernst Mayr framed evolution as a "problem of interaction" in 1947.
  • Interactions occur at multiple biological levels: organismal parts, individuals, populations, species, and environment.
  • Coevolutionary dynamics are central to understanding biological complexity.

Purpose of the Study:

  • To review progress on Mayr's "problem of interaction" framework.
  • To compare biotic vs. abiotic selection and different selection regimes (fluctuating, directional, stabilizing) in shaping genomic architecture.
  • To examine case studies on the evolution of acquired toxicity in animals.

Main Methods:

  • Literature review and synthesis of evolutionary biology concepts.
  • Comparative analysis of selection pressures and their impact on genetic architecture.
  • Case study analysis of acquired toxicity evolution.

Main Results:

  • Oligogenic architectures may result from fluctuating and biotic selection.
  • Polygenic architectures may result from directional, stabilizing, and abiotic selection.
  • Case studies illustrate the "problem of interaction" in acquired toxicity.

Conclusions:

  • Mayr's "problem of interaction" framework remains highly relevant for evolutionary biology.
  • The interplay of biotic and abiotic factors, alongside selection regimes, influences genomic architecture.
  • Further research is needed on adaptive allele dynamics and effect sizes.