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Related Concept Videos

Meiosis I03:09

Meiosis I

30.7K
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 I01:49

Meiosis I

176.5K
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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Nondisjunction01:29

Nondisjunction

67.7K
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.
67.7K
Nondisjunction01:21

Nondisjunction

4.5K
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
4.5K
Meiosis II02:02

Meiosis II

32.6K
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,...
32.6K
Meiosis II01:57

Meiosis II

169.1K
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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Updated: Apr 26, 2026

An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis
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An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis

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Unresolved issues in pre-meiotic anther development.

Timothy Kelliher1, Rachel L Egger2, Han Zhang2

  • 1Syngenta Biotechnology Inc., Research Triangle Park NC, USA.

Frontiers in Plant Science
|August 8, 2014
PubMed
Summary
This summary is machine-generated.

Anther development, crucial for plant reproduction, shows conserved steps across flowering plants. This study compares Arabidopsis, rice, and maize to reveal differences in developmental timing and mechanisms, particularly concerning small RNAs.

Keywords:
arabidopsiscell fate specificationmaizemeiosisphased small RNAricetapetum

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Live Imaging Characterization of Centromere Movements During Male Meiotic Prophase in Arabidopsis thaliana
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Area of Science:

  • Plant developmental biology
  • Reproductive biology
  • Genetics and genomics

Background:

  • Anther ontogeny, cell types, and organ shape are highly conserved in Angiosperms.
  • Male-sterility often results from defects in pre-meiotic anther development, facilitating mutant identification.
  • Despite progress, fundamental questions in anther development persist, and cross-species applicability of findings is uncertain.

Purpose of the Study:

  • To compare developmental pace and mechanisms in immature anthers of Arabidopsis, rice, and maize.
  • To analyze archesporial cell specification, meiotic preparation, and secondary parietal layer formation.
  • To examine the roles of small RNAs, including grass-specific phasiRNAs, in anther development.

Main Methods:

  • Comparative analysis of immature anthers from Arabidopsis, rice, and maize.
  • Investigation of cell fate specification mechanisms for archesporial cells.
  • Review of secondary parietal layer division and small RNA functions.

Main Results:

  • Identified distinctions in the developmental pace of anthers across the studied species.
  • Detailed the processes of archesporial cell specification and meiotic preparation.
  • Highlighted the role of the secondary parietal layer's periclinal division in generating key cell layers.
  • Examined the involvement of small RNAs, with a focus on phasiRNAs in grasses.

Conclusions:

  • Comparative analysis reveals species-specific variations in anther developmental timing and mechanisms.
  • Understanding these differences is crucial for applying findings across different plant species.
  • Small RNAs, particularly phasiRNAs in grasses, play significant roles in anther development.