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Related Concept Videos

Convergent Evolution01:54

Convergent Evolution

34.1K
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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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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What is Natural Selection?01:32

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Eukaryotic Evolution01:24

Eukaryotic Evolution

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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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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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Silent evolution.

Syozo Osawa, Zhi-Hui Su, Masaaki Nishikawa

    Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
    |November 15, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Beetle evolution involved a "silent evolution" stage with no physical changes, revealed by mitochondrial DNA analysis. This finding introduces a new concept in evolutionary biology.

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    Area of Science:

    • Evolutionary Biology
    • Genetics
    • Zoology

    Background:

    • Morphological stasis is observed in some evolutionary lineages.
    • Understanding the genetic mechanisms behind evolutionary stasis is crucial.

    Purpose of the Study:

    • To investigate the evolutionary history of beetles using molecular data.
    • To identify potential stages of evolutionary stasis in beetle diversification.

    Main Methods:

    • Phylogenetic analysis of mitochondrial DNA sequences from various beetle species.
    • Comparative analysis of genetic divergence and morphological evolution.

    Main Results:

    • Mitochondrial DNA phylogenetic analyses revealed a distinct evolutionary stage in beetles characterized by a lack of morphological change.
    • This 'silent' period suggests genetic evolution occurred independently of external physical alterations.

    Conclusions:

    • The study proposes a new evolutionary process category: 'silent evolution'.
    • This concept highlights that evolution can proceed without observable morphological changes, driven by genetic mechanisms.