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相关概念视频

The Evidence for Evolution02:55

The Evidence for Evolution

42.8K
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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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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What is Evolutionary History?02:35

What is Evolutionary History?

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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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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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Convergent Evolution01:54

Convergent Evolution

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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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Limits to Natural Selection01:38

Limits to Natural Selection

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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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相关实验视频

Updated: Jul 9, 2025

The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
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The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions

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对复杂多细胞性进化的宏观进化模式的非适应性解释.

Emma P Bingham1,2, William C Ratcliff3

  • 1School of Physics, Georgia Institute of Technology. Atlanta, Georgia 30332, USA.

bioRxiv : the preprint server for biology
|November 28, 2023
PubMed
概括

遗传漂移在真核生物和原核生物中不同影响多细胞性进化. 由谱系特异性突变偏差驱动的真核生物基因组扩张和 prokaryotic 侵蚀,解释了为什么复杂的多细胞性只在真核生物中进化.

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科学领域:

  • 进化生物学 进化生物学
  • 基因组学就是基因组学.
  • 宏观进化是如何发生的

背景情况:

  • 复杂的多细胞性,由专门的细胞类型定义,在真核生物中独立进化,但不是 prokaryotes.
  • 现有的假设表明,真核细胞的创新,如动态细胞骨或基因调节是前提条件.
  • 复杂多细胞性在真核生物中的独立进化的宏观进化模式仍然无法解释.

研究的目的:

  • 为复杂多细胞的进化提出一个替代的,非适应性的假设.
  • 调查遗传漂移和血统特异性突变偏差在这个进化模式中的作用.

主要方法:

  • 种群遗传学的理论建模,重点关注有效种群大小 (Ne) 和遗传漂移.
  • 在真核和原核基因组中对突变偏差的比较分析.
  • 检查遗传瓶如何影响多细胞生物的进化轨迹.

主要成果:

  • 多细胞性降低了有效种群大小 (Ne),增加了遗传漂移的影响.
  • 细胞表现出突变偏差,促进基因组扩张,为创新提供材料.
  • Prokaryotes 一般经历基因组侵蚀,限制了复杂性的进化潜力.

结论:

  • 血统特定的突变偏差,而不仅仅是细胞生物学创新,可能解释为什么复杂的多细胞性在真核生物中进化而不是 prokaryotes.
  • 由这些偏见驱动的基因漂移的不同进化反应是理解这种宏观进化模式的关键.
  • 这种假设为复杂的多细胞生命进化的先决条件提供了新的视角.