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相关概念视频

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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Phylogeny01:23

Phylogeny

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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Phylogenetic Trees03:21

Phylogenetic Trees

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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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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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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...
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Diversity of Protists III01:27

Diversity of Protists III

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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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相关实验视频

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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

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根性假设的族群遗传学测试

Fernando D K Tria1, Giddy Landan1, Devani Romero Picazo1

  • 1Institute of General Microbiology, Kiel University, Kiel, Germany.

Genome biology and evolution
|May 29, 2023
PubMed
概括

这项研究引入了一种新的统计方法来推断物种的最后共同祖先 (LCA),简化了进化分析. 该方法提供了对早期物种化事件的强有力的类基因学见解.

科学领域:

  • 进化生物学 进化生物学
  • 人类基因组学是什么?
  • 计算生物学 计算生物学

背景情况:

  • 推断最后的共同祖先 (LCA) 对进化论至关重要.
  • 传统的LCA推断依赖于根植已解决的物种树,这可能是复杂的.

研究的目的:

  • 通过专注于直接的遗传学信号,独立于完整的物种树来重新构建LCA推断.
  • 开发一个统计框架来测试LCA假设和推断早期物种化事件.

主要方法:

  • 在统计假设测试中对LCA和根推理进行了改革.
  • 开发了一个分析程序来测试竞争的LCA假设.
  • 利用所有基因家族的基因组数据进行推断.

主要成果:

  • 成功推断了opisthokonta LCA,与现有知识保持一致.
  • 推断出蛋白质细菌LCA,表明与Epsilon蛋白质细菌的密切关系以及潜在的化学性自营性,无氧生活方式.
  • 证明了统计类基因组框架的力量和稳定性.

结论:

  • 新的统计方法提供了一种强大而稳健的方法,用于对LCA的基因组推断.
关键词:
最后的共同祖先 (LCA)人类遗传学是个学科.蛋白质细菌是一种蛋白质细菌.扎根就是扎根.树种 树种 树种 树种

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  • 这种方法简化了与完整的物种树分辨率相比,LCA重建的任务.
  • 提供了对古代生物的进化历史和潜在生活方式的新见解.