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相关概念视频

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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The Fossil Record02:56

The Fossil Record

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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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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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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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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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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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Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face
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化石和人类的进化

Sergio Almécija1,2,3, Ashley S Hammond4,2, Nathan E Thompson5

  • 1Division of Anthropology, American Museum of Natural History (AMNH), New York, NY 10024, USA. salmecija@amnh.org.

Science (New York, N.Y.)
|May 7, 2021
PubMed
概括
此摘要是机器生成的。

人类的起源可以追溯到非洲, 早期的原始人可能与现代的猿类和人类有很大的不同.

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Sampling and Pretreatment of Tooth Enamel Carbonate for Stable Carbon and Oxygen Isotope Analysis
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科学领域:

  • 古人类学
  • 灵长类动物的进化
  • 人类的起源

背景情况:

  • 人类和现代人猿 (类人猿) 具有相同的特征,如直立的姿势,但化石证据表明古代的多样性.
  • 活着的原始人代表了一种更为多样化的物种群.
  • 了解黑猩猩与人类的最后共同祖先是重建早期人类进化的关键.

研究的目的:

  • 重建黑猩猩人类最后一个共同祖先的形态,行为和环境.
  • 研究人类血统的进化差异.
  • 为了了解人类从米奥森猿祖先的起源.

主要方法:

  • 分析人类的化石记录.
  • 现存和灭绝的原始人类的比较形态.
  • 重建祖先的状态和环境.

主要成果:

  • 化石记录显示,古代人类的多样性比现在更大.
  • 没有一个古老的物种拥有现代人猿所见的所有运动能力.
  • 由于类似的选择性压力,现代猿类之间的一些共同特征可能是独立进化的.

结论:

  • 人类起源于非洲,
  • 人类的进化涉及平行适应和更广泛的祖先形式.
  • 重建最后一个共同祖先对于理解人类血统起源至关重要.