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Binary Fission

Binary Fission

Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...

Binary Fission

Binary Fission

Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.

Chromosome Structure

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...

Chromosome Structure

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...

Nucleoid

Nucleoid

The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...

Condensins

Condensins

Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...

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Related Experiment Video

Updated: Jun 15, 2026

Live Cell Imaging of Chromosome Segregation During Mitosis

Live Cell Imaging of Chromosome Segregation During Mitosis

Published on: March 14, 2018

Bacterial chromosome organization and segregation.

Esteban Toro¹, Lucy Shapiro

¹Department of Developmental Biology, Beckman Center, Stanford University School of Medicine, Stanford, California 94305, USA. etoro@stanford.edu

Cold Spring Harbor Perspectives in Biology

|February 26, 2010

Summary

Bacterial DNA is highly organized within cells, with new research showing its structure is passed down through generations. This organization is crucial for cell division and varies between bacterial species.

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Live Cell Imaging of Chromosome Segregation During Mitosis

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Published on: March 14, 2018

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Area of Science:

Microbiology
Cell Biology
Molecular Biology

Background:

Bacterial chromosomes are extremely long relative to cell size, presenting significant organizational challenges.
The bacterial nucleoid (DNA-containing region) is now understood to be highly structured and oriented within the cell.
Cell envelope anchoring and segregation mechanisms ensure faithful transmission of genetic material.

Purpose of the Study:

To investigate the organizational principles of the bacterial nucleoid.
To understand how DNA organization is maintained across cell generations.
To explore the diversity of chromosome segregation mechanisms in bacteria.

Main Methods:

Advanced cell-imaging techniques with subdiffraction resolution.
Microscopy and genetic analysis of bacterial cell division.
Comparative studies across different bacterial species.

Main Results:

The bacterial nucleoid exhibits reliable orientation and high-level organization.
DNA segregation is actively managed, often involving a mitotic-like machinery.
Mechanisms for chromosome segregation demonstrate significant interspecies variability.

Conclusions:

Bacterial chromosome organization is a dynamic and essential process for cell viability.
Progressive segregation and cell envelope anchoring are key to transmitting genetic information.
Understanding species-specific segregation modes is critical for bacterial biology.