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Related Concept Videos

Meiosis I01:49

Meiosis I

193.7K
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...
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Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
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Crossing Over01:34

Crossing Over

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
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What is Meiosis?01:36

What is Meiosis?

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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Meiosis II02:02

Meiosis II

45.8K
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
45.8K
Nondisjunction01:29

Nondisjunction

75.7K
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Updated: Jul 15, 2025

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
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Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II

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Meiosis: Dances Between Homologs.

Denise Zickler1, Nancy Kleckner2

  • 1Institute for Integrative Biology of the Cell (I2BC), Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, France.

Annual Review of Genetics
|October 3, 2023
PubMed
Summary

Meiosis shuffles genetic information through DNA crossing-over and homologous chromosome interactions. This complex process, involving recombination and chromosome movements, may have evolved from mitotic chromosome development.

Keywords:
chromosomecrossover interferenceevolutionmeiosismitosis versus meiosispairingrecombination

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Area of Science:

  • Genetics
  • Cell Biology
  • Molecular Biology

Background:

  • Meiosis is essential for genetic diversity through Mendelian segregation and DNA crossing-over.
  • Homologous chromosome interactions are central to the meiotic cellular program.
  • Understanding these interactions is key to comprehending genetic inheritance and variation.

Purpose of the Study:

  • To provide a background on the principles of meiotic chromosome interactions.
  • To summarize current knowledge on DNA recombination and chromosome-level meiotic processes.
  • To explore the evolutionary origins of the meiotic program.

Main Methods:

  • Review of fundamental principles of meiosis.
  • Synthesis of current research on DNA recombination events.
  • Analysis of processes including homolog pairing, crossover interference, and chiasma maturation.
  • Examination of physical interactions between recombination complexes and chromosome structures.

Main Results:

  • Meiotic processes rely on physical interactions between recombination complexes and chromosome structures.
  • Key meiotic events include homolog pairing, crossover interference, and chiasma maturation.
  • Convergent evidence suggests the meiotic program evolved by linking chromosome interactions to mitotic morphogenesis.

Conclusions:

  • The meiotic program is a complex interplay of genetic recombination and chromosome dynamics.
  • Evolutionary origins of meiosis may be linked to mitotic chromosome development.
  • Further research into these interactions can illuminate mechanisms of genetic inheritance and evolution.