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Videos de Conceptos Relacionados

The Evidence for Evolution02:55

The Evidence for Evolution

40.1K
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 Tree of Life - Bacteria, Archaea, Eukaryotes02:40

The Tree of Life - Bacteria, Archaea, Eukaryotes

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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
36.5K
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

5.8K
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...
5.8K
Synteny and Evolution02:31

Synteny and Evolution

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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.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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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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Microbial Phylogeny01:28

Microbial Phylogeny

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Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...
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Complete mitochondrial genome and phylogenetic position of the gall aphid <i>Chaetogeoica ulmidrupa</i> (Hemiptera: Aphididae).

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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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¿Se probó la ascendencia común universal?

Takahiro Yonezawa1, Masami Hasegawa

  • 1School of Life Sciences, Fudan University, Shanghai 200433, China.

Nature
|December 18, 2010
PubMed
Resumen

El estudio probó estadísticamente la ascendencia común universal (UCA) para toda la vida, encontrando que la evidencia actual es insuficiente para descartar orígenes separados para los tres dominios de la vida.

Área de la Ciencia:

  • Biología evolutiva Biología evolutiva.
  • La genómica es la genómica.
  • La bioinformática es la bioinformática.

Sus antecedentes:

  • La teoría de la ascendencia común universal (UCA) postula que toda la vida en la Tierra comparte un único antepasado común, un concepto fundamental en la biología evolutiva desde Darwin.
  • A pesar de las extensas pruebas circunstanciales, han faltado rigurosas pruebas estadísticas de UCA utilizando secuencias moleculares en los tres dominios de la vida (eubacteria, arqueobacteria y eucariotas).
  • Los análisis estadísticos recientes han apoyado la ACU, pero quedan dudas sobre su suficiencia para rechazar definitivamente las hipótesis alternativas.

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