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Synteny and Evolution02:31

Synteny and Evolution

3.5K
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...
3.5K
The Fossil Record02:56

The Fossil Record

26.4K
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...
26.4K
What is Evolutionary History?02:35

What is Evolutionary History?

41.2K
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.
41.2K
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.
45.5K
Phylogeny01:23

Phylogeny

55.7K
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.
55.7K
Eukaryotic Evolution01:24

Eukaryotic Evolution

39.1K
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...
39.1K

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Video Experimental Relacionado

Updated: Nov 6, 2025

Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face
08:15

Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face

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Los simios fósiles y la evolución humana

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
Resumen
Este resumen es generado por máquina.

Los orígenes humanos se remontan a África, divergiendo de los antepasados de los simios hace ~9.3 a 6.5 millones de años. Los primeros homínidos probablemente diferían significativamente de los monos y los humanos modernos.

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Área de la Ciencia:

  • Paleoantropología
  • La evolución de los primates
  • Los orígenes del hombre

Sus antecedentes:

  • Los humanos y los simios modernos (hominoides) comparten características como la postura vertical, pero la evidencia fósil sugiere una diversidad antigua.
  • Los hominoides vivos representan una muestra limitada de un grupo una vez más diverso de especies.
  • Comprender el último antepasado común chimpancé-humano es clave para reconstruir la evolución temprana de los homínidos.

Objetivo del estudio:

  • Para reconstruir la morfología, el comportamiento y el entorno del último ancestro común chimpancé-humano.
  • Investigar la divergencia evolutiva del linaje humano (homínidos).
  • Para entender los orígenes de los homínidos de los antepasados de los simios del Mioceno.

Principales métodos:

  • Análisis del registro fósil de los homínidos.
  • Morfología comparativa de hominoides existentes y extintos.
  • Reconstrucción de estados y entornos ancestrales.

Principales resultados:

  • El registro fósil revela una mayor diversidad de homínidos antiguos de lo que existe actualmente.
  • Ninguna especie antigua poseía todas las adaptaciones locomotoras que se ven en los simios modernos.
  • Algunas características compartidas entre los simios modernos pueden haber evolucionado de forma independiente debido a presiones selectivas similares.

Conclusiones:

  • Los homínidos se originaron en África de antepasados simios del Mioceno que eran diferentes a cualquier especie de simio vivo.
  • La evolución de los homínidos involucró adaptaciones paralelas y una gama más amplia de formas ancestrales.
  • Reconstruir el último antepasado común es crucial para entender los orígenes del linaje humano.