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Related Concept Videos

Phylogeny01:23

Phylogeny

46.9K
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

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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.
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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.
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Related Experiment Video

Updated: Sep 9, 2025

A System for Tracking the Dynamics of Social Preference Behavior in Small Rodents
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Evolution of thumbnails across Rodentia.

Rafaela V Missagia1,2, Anderson Feijó2,3, Lauren Johnson4

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This summary is machine-generated.

Rodents

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Area of Science:

  • Evolutionary biology
  • Paleontology
  • Comparative anatomy

Background:

  • The first digit (D1) unguis in tetrapods has functional adaptations, but its macroevolutionary link to ecological diversity is unclear.
  • Rodents exhibit diverse D1 unguis morphologies, with most lineages possessing D1 nails.

Purpose of the Study:

  • To investigate the macroevolutionary association between D1 unguis morphology and ecological diversity in rodents.
  • To understand the role of D1 unguis in rodent adaptive radiation and niche exploitation.

Main Methods:

  • Phylogenetic analysis of extant rodent genera.
  • Comparative analysis of D1 unguis morphology across different ecological niches.
  • Reconstruction of ancestral D1 unguis states.

Main Results:

  • Most rodent genera and ancestral lineages possess D1 nails.
  • Independent evolution of D1 claws in subterranean rodents and D1 unguis loss in oral-feeding specialists.
  • Early D1 nail acquisition and manual dexterity likely facilitated exploitation of hard seeds and nuts.

Conclusions:

  • D1 unguis morphology is strongly linked to rodent ecological specialization and evolutionary success.
  • The evolution of D1 nails and manual dexterity was crucial for rodents to exploit hard-to-access food resources.
  • This study reveals a novel factor contributing to the remarkable radiation of rodents.