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Related Concept Videos

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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The Evidence for Evolution02:55

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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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Gene Duplication and Divergence02:37

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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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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Changes in the Appendicular Skeleton with Age01:09

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Related Experiment Video

Updated: Feb 17, 2026

Rearing and Double-stranded RNA-mediated Gene Knockdown in the Hide Beetle, Dermestes maculatus
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The evolutionary origin of digit patterning.

Thomas A Stewart1,2,3, Ramray Bhat4, Stuart A Newman5

  • 1Department of Ecology and Evolutionary Biology, Yale University, 300 Heffernan Dr, West Haven, CT 06515 USA.

Evodevo
|December 5, 2017
PubMed
Summary
This summary is machine-generated.

The evolution of tetrapod limbs from fins is explained by Turing-type mechanisms and experimental data. This research clarifies the fin-to-limb transition using developmental genetics and mathematical models.

Keywords:
DevelopmentFinGeneticsNoveltySelf-organizationTuring

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Area of Science:

  • Evolutionary Biology
  • Developmental Biology
  • Mathematical Biology

Background:

  • The transition of paired fins to tetrapod limbs is a key evolutionary event.
  • Understanding this transition requires integrating evolutionary and developmental perspectives.

Purpose of the Study:

  • To synthesize recent findings on the fin-to-limb transition.
  • To propose a framework for understanding limb evolution based on developmental mechanisms.

Main Methods:

  • Review of experimental studies in finned vertebrates (e.g., catshark, zebrafish).
  • Analysis of mathematical models of Turing-type reaction-diffusion systems.
  • Examination of evolutionary scenarios for patterning networks.

Main Results:

  • Limb skeleton patterning involves Turing-type reaction-diffusion mechanisms.
  • Developmental parallels exist between fin skeletons and tetrapod digits.
  • Mathematical models and evolutionary analyses offer scenarios for patterning network origins.

Conclusions:

  • Confluence of experimental, physics, and genetics approaches advances understanding of fin-to-limb transition.
  • Key challenges remain in novelty, homology, and cell differentiation-pattern formation relationships.