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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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Convergent Evolution01:54

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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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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.
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Synteny and Evolution02:31

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Gene Evolution - Fast or Slow?02:05

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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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Molecular Evolution of the Tre Recombinase
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Evolution and inevitability.

Ian Tattersall1

  • 1Division of Anthropology, American Museum of Natural History, New York, New York.

Annals of the New York Academy of Sciences
|June 21, 2018
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Summary
This summary is machine-generated.

This study explores evolutionary biology and cosmology, questioning life's origins and diversity across the universe. It considers alternative evolutionary paths and extraterrestrial life possibilities.

Keywords:
Homo sapiensPermian extinctionbiological complexitycomplexitydiversificationintelligence

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Area of Science:

  • Astrobiology
  • Evolutionary Biology
  • Cosmology

Background:

  • The study addresses fundamental questions regarding the nature of biological evolution.
  • It also delves into the immense scale and implications of the Universe's vastness.

Purpose of the Study:

  • To explore the nature of evolution and its potential variations.
  • To speculate on the conditions for life on other planets.
  • To consider alternative evolutionary trajectories.

Main Methods:

  • Conceptual analysis and theoretical exploration.
  • Review of existing evolutionary and cosmological theories.
  • Philosophical inquiry into the origins and diversity of life.

Main Results:

  • Evolutionary processes may yield diverse life forms under different conditions.
  • The vastness of the universe suggests a high probability for extraterrestrial life.
  • Alternative evolutionary pathways could lead to vastly different life chemistries and forms.

Conclusions:

  • Life's emergence and evolution are potentially influenced by numerous factors.
  • The search for extraterrestrial life is scientifically and philosophically significant.
  • Understanding evolution on Earth provides a framework for considering life elsewhere.