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Related Concept Videos

Meiosis I01:49

Meiosis I

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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 I03:09

Meiosis I

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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...
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Meiosis II02:02

Meiosis II

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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,...
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Meiosis II01:57

Meiosis II

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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...
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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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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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Related Experiment Video

Updated: Feb 26, 2026

Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae
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The histone codes for meiosis.

Lina Wang1,2, Zhiliang Xu1,3, Muhammad Babar Khawar4

  • 1State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, People's Republic of China.

Reproduction (Cambridge, England)
|July 12, 2017
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Summary

Histone codes regulate key events in meiosis, including DNA repair and cell division, ensuring proper gamete formation during spermatogenesis and oogenesis. This review details their crucial roles and future research directions.

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Area of Science:

  • Cell Biology
  • Genetics
  • Epigenetics

Background:

  • Meiosis is essential for sexual reproduction, producing haploid gametes from diploid cells through two divisions.
  • Key meiotic events include programmed DNA double-strand break formation, homologous recombination, and crossover resolution.
  • Histone modifications, known as 'histone codes', dynamically regulate chromatin and transcription during meiosis.

Purpose of the Study:

  • To review the essential histone codes governing meiosis during spermatogenesis and oogenesis.
  • To elucidate the functional roles of histone codes in critical meiotic processes.
  • To discuss future research perspectives in the field of meiotic histone codes.

Main Methods:

  • Systematic literature review of studies on histone modifications in meiosis.
  • Analysis of the functional roles of specific histone codes in spermatogenesis and oogenesis.
  • Synthesis of current knowledge and identification of research gaps.

Main Results:

  • Histone codes are critical for regulating meiosis resumption and meiotic asymmetric division.
  • Specific histone modifications are associated with programmed DNA double-strand break formation and homologous recombination.
  • Dynamic chromatin remodeling via histone codes ensures proper chromosomal segregation.

Conclusions:

  • Histone codes play indispensable roles in orchestrating complex meiotic events.
  • Understanding these epigenetic marks is crucial for fertility and reproductive health.
  • Further research into histone codes will uncover novel therapeutic targets for reproductive disorders.