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Related Concept Videos

Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
Meiosis II01:57

Meiosis II

Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...

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Related Experiment Video

Updated: Jun 24, 2026

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
10:52

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

Published on: August 13, 2016

Meiotic spindle self-organization: one plus one equals only one.

Radhika Subramanian1, Tarun Kapoor

  • 1The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.

Current Biology : CB
|April 17, 2009
PubMed
Summary

Spindle fusion experiments tested models of how the bipolar spindle, a key cellular structure, forms and maintains its size. These studies provide new insights into cellular morphogenesis and size regulation.

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Related Experiment Videos

Last Updated: Jun 24, 2026

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
10:52

Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets

Published on: August 13, 2016

Self-Assembly of Microtubule Tactoids
08:49

Self-Assembly of Microtubule Tactoids

Published on: June 23, 2022

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
09:16

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing

Published on: October 11, 2015

Area of Science:

  • Cell Biology
  • Cytoskeleton Dynamics
  • Microscopy and Imaging

Background:

  • The bipolar spindle is a crucial organelle in cell division, exhibiting defined size and shape.
  • Understanding spindle morphogenesis and size control is essential for comprehending cell division accuracy.

Purpose of the Study:

  • To test existing models of spindle morphogenesis and size control.
  • To investigate the physical mechanisms governing spindle size and shape.

Main Methods:

  • Utilized spindle fusion experiments involving micro-manipulation.
  • Applied advanced microscopy techniques to observe spindle dynamics.

Main Results:

  • Experimental data provided critical validation or refutation of current theoretical models.
  • Demonstrated the role of physical forces in spindle size determination.

Conclusions:

  • The study offers a refined understanding of how the bipolar spindle achieves its characteristic size and shape.
  • Findings contribute to the broader knowledge of organelle biogenesis and regulation.