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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...
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Karyotyping01:17

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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”

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Updated: May 12, 2026

Analysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes
12:11

Analysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes

Published on: May 11, 2017

Subchromosomal karyotype evolution in Equidae.

P Musilova1, S Kubickova, J Vahala

  • 1Department of Genetics and Reproduction, Veterinary Research Institute, Brno, Czech Republic. musilova@vri.cz

Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology
|March 28, 2013
PubMed
Summary
This summary is machine-generated.

Comparative chromosome mapping reveals rapid karyotype evolution in Equidae. Centric fusions are common, while Hartmann

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2D and 3D Chromosome Painting in Malaria Mosquitoes
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Last Updated: May 12, 2026

Analysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes
12:11

Analysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes

Published on: May 11, 2017

2D and 3D Chromosome Painting in Malaria Mosquitoes
09:57

2D and 3D Chromosome Painting in Malaria Mosquitoes

Published on: January 6, 2014

Area of Science:

  • Genetics
  • Comparative Genomics
  • Evolutionary Biology

Background:

  • The family Equidae, including horses, asses, and zebras, exhibits significant karyotype diversity despite recent divergence.
  • Understanding chromosome evolution in equids is crucial for tracing phylogenetic relationships and identifying genomic rearrangements.

Purpose of the Study:

  • To perform subchromosomal comparative mapping across seven Equidae species to detail chromosome evolution.
  • To identify and characterize chromosome fusions, inversions, and centromere repositioning events within the Equidae family.

Main Methods:

  • Utilized region-specific painting and bacterial artificial chromosome (BAC) probes for subchromosomal comparative mapping.
  • Determined the orientation of evolutionarily conserved segments relative to centromere positions.

Main Results:

  • Identified centric fusion as the predominant fusion type in Equidae evolution.
  • Tandem telomere-telomere fusions were found to be characteristic of Hartmann's zebra karyotype evolution.
  • Detailed specific inversions and centromere repositioning events in various equid species, including zebras, asses, and horses.

Conclusions:

  • Subchromosomal mapping provides a high-resolution view of equid karyotype evolution.
  • Centromere repositioning and inversions play significant roles in shaping equid chromosome diversity.
  • The study elucidates the mechanisms driving rapid karyotype evolution in the Equidae family.