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Related Concept Videos

Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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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.
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Chromosomal Theory of Inheritance

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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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Chromosome Structure02:40

Chromosome Structure

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Telomeres consist of non-coding repetitive nucleotide...
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Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Euchromatin01:01

Euchromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Updated: Oct 18, 2025

2D and 3D Chromosome Painting in Malaria Mosquitoes
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Why Do Some Vertebrates Have Microchromosomes?

Kornsorn Srikulnath1,2,3,4,5, Syed Farhan Ahmad1,2,3,4, Worapong Singchat1,2,4

  • 1Animal Genomics and Bioresource Research Center (AGB Research Center), Faculty of Science, Kasetsart University, 50 Ngamwongwan, Chatuchak, Bangkok 10900, Thailand.

Cells
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

Microchromosomes are small, distinct elements in vertebrate karyotypes. This review explores their unique genome features, evolutionary origins, and impact on karyotype evolution across diverse lineages.

Keywords:
chromosomal rearrangementsevolutiongenesgenomekaryotype

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Cytogenetics

Background:

  • Vertebrates exhibit significant karyotype diversity, with microchromosomes being a notable feature in many species.
  • The evolutionary origins and functional significance of microchromosomes remain largely unclear.
  • Microchromosomes possess distinct genomic characteristics compared to larger macrochromosomes.

Purpose of the Study:

  • To review current concepts on the dynamic nature of vertebrate karyotype evolution, focusing on microchromosomes.
  • To elucidate the evolutionary origins and ramifications of microchromosomes.
  • To characterize the evolutionary forces driving microchromosome evolution.

Main Methods:

  • Review of recent literature on vertebrate karyotype evolution and microchromosome characteristics.
  • Analysis of microchromosome distribution across different vertebrate lineages.
  • Characterization of genomic features (gene density, heterochromatin, recombination rates) of microchromosomes.

Main Results:

  • Microchromosomes are characterized by high gene densities, low heterochromatin content, and high recombination rates.
  • Their presence varies significantly across vertebrate lineages, indicating dynamic evolutionary processes.
  • Specific evolutionary forces contribute to the origin and maintenance of microchromosomes.

Conclusions:

  • Microchromosomes represent a dynamic component of vertebrate karyotype evolution with unique genomic properties.
  • Further research is needed to fully understand their evolutionary trajectories and biological significance.
  • Understanding microchromosome evolution provides insights into broader patterns of genome evolution.