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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 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.
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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.
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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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Manipulation of Ploidy in Caenorhabditis elegans
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How diploidization turned a tetraploid into a pseudotriploid.

Terezie Mandáková1, Andrew D Gloss2, Noah K Whiteman2

  • 1Plant Cytogenomics Research Group, CEITEC-Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic.

American Journal of Botany
|May 22, 2016
PubMed
Summary

The North American heartleaf bittercress, despite its triploid-like chromosome number, is a diploidized tetraploid. Its genome structure evolved through descending dysploidy, not triploid hybridization, offering insights into plant genome evolution.

Keywords:
Brassicaceaecentromere losschromosome fusionchromosome translocationdiploidizationdysploidykaryotype evolutionpolyploidywhole-genome duplication

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Area of Science:

  • Genomics
  • Plant Biology
  • Evolutionary Biology

Background:

  • The North American heartleaf bittercress (Cardamine cordifolia) exhibits a puzzling triploid-like chromosome number (2n = 24) despite high fertility.
  • Most triploid organisms are sterile, prompting an investigation into C. cordifolia's genome.

Purpose of the Study:

  • To elucidate the origin and structure of the Cardamine cordifolia genome.
  • To understand the evolutionary mechanisms behind its unusual chromosome number.

Main Methods:

  • Comparative chromosome painting using Arabidopsis thaliana BAC contigs.
  • Analysis of mitotic and meiotic chromosome complements.
  • Multicolor fluorescence microscopy and comparison with Brassicaceae genomes.

Main Results:

  • Cardamine cordifolia is a diploidized tetraploid, not a triploid hybrid.
  • Regular, diploid-like meiotic pairing was observed.
  • The ancestral tetraploid chromosome number (2n = 32) was reduced to 2n = 24 via four terminal chromosome translocations.

Conclusions:

  • The C. cordifolia genome structure resulted from stepwise diploidization after whole-genome duplication.
  • Translocation-based descending dysploidy (n=16 to n=12) involved the formation of five new chromosomes.
  • This study provides insights into postpolyploidy rediploidization and suggests chromosome number is not always a reliable indicator of evolutionary history.