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Related Concept Videos

Synteny and Evolution02:31

Synteny and Evolution

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 chromosome underwent...
Phylogeny01:23

Phylogeny

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.
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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...
Eukaryotic Evolution01:24

Eukaryotic Evolution

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...
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Convergent Evolution01:54

Convergent Evolution

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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Updated: May 21, 2026

Laboratory Maintenance of the Lower Dipteran Fly Bradysia (Sciara) coprophila: A New/Old Emerging Model Organism
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Laboratory Maintenance of the Lower Dipteran Fly Bradysia (Sciara) coprophila: A New/Old Emerging Model Organism

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Non-Sciuromorph rodent karyotypes in evolution.

S A Romanenko1, V Volobouev

  • 1Institute of Molecular and Cellular Biology, SB RAS, Novosibirsk, Russia. rosa@mcb.nsc.ru

Cytogenetic and Genome Research
|June 16, 2012
PubMed
Summary
This summary is machine-generated.

Rodents exhibit remarkable genomic diversity, including unique chromosome variations and sex determination. Studying rodent genome evolution is key to understanding mammalian evolution patterns and speciation processes.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Mammalian Genetics

Background:

  • Rodents represent the most species-rich mammalian order.
  • They possess unique genomic features like high karyotypic diversity and unusual sex determination mechanisms.
  • Rodent genomes show significant heterochromatin heterogeneity and rapid karyotype evolution.

Purpose of the Study:

  • To review current data on rodent genomic evolution.
  • To highlight unresolved questions in rodent cytogenetics and comparative genomics.
  • To understand the tempo and mode of mammalian evolution through rodent models.

Main Methods:

  • Classical cytogenetics
  • Molecular cytogenetics
  • Comparative genomics

Main Results:

  • Rodents display exceptional karyotypic diversity and intraspecies chromosome variability.
  • Unusual chromosomal sex determination mechanisms are prevalent in rodents.
  • Rapid karyotype reorganization and speciation occur without significant genetic divergence.

Conclusions:

  • Rodent genomic peculiarities are crucial for understanding mammalian evolution.
  • Further research is needed to resolve emerging and existing problems in rodent genomic evolution.
  • Integrating cytogenetic and genomic data is essential for a comprehensive view.