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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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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.
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Speciation Rates01:07

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Related Experiment Video

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Resurrection of Dormant Daphnia magna: Protocol and Applications
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The Timing of Evolutionary Transitions Suggests Intelligent Life is Rare.

Andrew E Snyder-Beattie1, Anders Sandberg2, K Eric Drexler2

  • 1Mathematical Ecology Research Group, University of Oxford, Oxford, United Kingdom.

Astrobiology
|November 20, 2020
PubMed
Summary

The emergence of complex, intelligent extraterrestrial life may be exceptionally rare. Our model suggests evolutionary transitions required for intelligence likely take longer than Earth

Keywords:
Bayesian analysis.Evolutionary transitionsObservation selection effects

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Area of Science:

  • Astrobiology and Evolutionary Biology
  • Origin and Evolution of Life
  • Search for Extraterrestrial Intelligence (SETI)

Background:

  • The abundance and nature of extraterrestrial life remain unknown.
  • Earth's complex intelligent life arose through key evolutionary transitions (abiogenesis, eukaryogenesis, multicellularity, intelligence).
  • The probability and timing of these transitions are crucial for estimating life's prevalence.

Purpose of the Study:

  • To evaluate the probability of evolving intelligent life elsewhere in the universe.
  • To analyze the timing of evolutionary transitions using a Bayesian framework.
  • To test assumptions about the rarity of evolutionary steps.

Main Methods:

  • Development of a simplified Bayesian model.
  • Incorporation of uninformative prior probabilities.
  • Analysis of the timing of key evolutionary transitions from the fossil record.

Main Results:

  • Estimated evolutionary transition times likely exceed Earth's lifetime by many orders of magnitude.
  • The findings support the hypothesis that intelligent life is exceptionally rare.
  • The model predicts unresolved biological paradoxes and uninhabitable planets around M dwarf stars.

Conclusions:

  • Intelligent life elsewhere may be exceedingly rare if analogous evolutionary transitions are required.
  • Alternative conclusions necessitate revised assumptions about transition probabilities or alternative evolutionary models.
  • The model provides a framework for assessing biological assumptions and fossil data impact on the probability of evolving intelligence.