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相关概念视频

Convergent Evolution01:54

Convergent Evolution

27.7K
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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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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Speciation Rates01:07

Speciation Rates

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Overview
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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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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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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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相关实验视频

Updated: Jul 2, 2025

Chemical Isolation, Quantification, and Separation of Skin Lipids from Reptiles
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Chemical Isolation, Quantification, and Separation of Skin Lipids from Reptiles

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蛇的宏观进化特征

Pascal O Title1,2,3, Sonal Singhal3,4, Michael C Grundler3

  • 1Department of Ecology and Evolution, Stony Brook University, Stony Brook, NY 11794, USA.

Science (New York, N.Y.)
|February 22, 2024
PubMed
概括
此摘要是机器生成的。

蛇和 (Squamata) 显示出了显著的进化适应. 它们的多样化,特别是在蛇中,通过专门的捕食策略重塑了生态系统,影响了脊椎动物的生物多样性.

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Last Updated: Jul 2, 2025

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科学领域:

  • 进化生物学
  • 动物学
  • 生态学

背景情况:

  • (蛇和) 占陆地脊椎动物的很大一部分.
  • 它们在运动,食和感官系统上展现了多种创新.
  • 它们的辐射背后的进化驱动因素尚不清楚.

研究的目的:

  • 调查状物宏观进化的原因和后果.
  • 了解蛇和的进化历史和多样化模式.

主要方法:

  • 使用了6万多种动物的个人自然历史观测.
  • 使用 1018 个物种 (5400 个位点) 的基因组数据构建了一个时间校准的基因组.

主要成果:

  • 标识了蛇的物种化和表型进化动态的变化.
  • 蛇中专门的捕食策略的出现和多样化.
  • 展示了蛇是如何在动物群体中改变食物结构的.

结论:

  • 状生物多样性是由历史的偶然性和早期蛇的进化所塑造的.
  • 蛇的独特进化事件对脊椎动物的生物多样性产生了深远的影响.