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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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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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Author Spotlight: Understanding Microbe Adaptation Using Innovative Techniques for Exploring Thermophilic Evolution
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Digest: Experimental evolution provides a window into the evolution of generalized pollination.

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  • 1Cornell University Department of Ecology and Evolutionary Biology.

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Plants with multiple pollinators, such as bumblebees and hoverflies, evolve unique trait combinations. This experimental evolution study provides evidence for a distinct generalized pollination phenotype, differing from single-pollinator plants.

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Area of Science:

  • Evolutionary biology
  • Plant-pollinator interactions
  • Phenotypic evolution

Background:

  • Investigating how plant reproductive traits evolve under different pollination strategies.
  • Examining whether diverse pollinator groups drive unique evolutionary trajectories.

Discussion:

  • Experimental evolution revealed that plants with dual pollination (bumblebees and hoverflies) developed novel trait values.
  • These evolved traits were not observed in plants exposed to single pollinator types.

Key Insights:

  • Plants exposed to multiple pollinators can evolve unique generalized phenotypes.
  • This challenges the assumption that mixed pollination necessarily leads to intermediate trait values.

Outlook:

  • Further research can explore the genetic basis of these unique generalized phenotypes.
  • Understanding these evolutionary dynamics is crucial for predicting plant adaptation in changing environments.