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Related Concept Videos

Mitosis and Cytokinesis01:35

Mitosis and Cytokinesis

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In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
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Mitosis and Cytokinesis02:03

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In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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Determining the Plane of Cell Division02:13

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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Updated: Mar 22, 2026

Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy
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CELL DIVISION IN SPIROGYRA. I. MITOSIS.

L C Fowke1, J D Pickett-Heaps1

  • 1Research School of Biological Sciences, Canberra City, Australia.

Journal of Phycology
|April 21, 2016
PubMed
Summary
This summary is machine-generated.

Microtubules in Spirogyra sp. cells exhibit dynamic rearrangement during cell division. Wall microtubules are observed to move to the spindle during preprophase and return during telophase.

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Area of Science:

  • Cell Biology
  • Cytology
  • Microscopy

Background:

  • Spirogyra sp. is a filamentous green alga.
  • Understanding cell division mechanisms is crucial in biology.

Purpose of the Study:

  • To investigate the dynamic behavior of microtubules during cell division in Spirogyra sp.
  • To elucidate the role of microtubules in nuclear and cytoplasmic events during mitosis.

Main Methods:

  • Light microscopy
  • Electron microscopy
  • Cytological observation

Main Results:

  • Microtubules reorganize from the cell wall to the spindle during mitosis.
  • Nucleolar fragmentation and association with chromosomes observed.
  • Nuclear envelope breakdown and reformation documented.
  • Organelles concentrate in polar cytoplasm during anaphase.

Conclusions:

  • Evidence suggests intact wall microtubules move to the spindle and return.
  • Microtubule dynamics are integral to Spirogyra cell division.