File:Chromosome connections in meiosis.jpg

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Chromosome Connections in Meiosis

Kinetochores attach homologous chromosomes to opposite halves of the spindle.

Homologs are held together by chiasmata, in which recombinant chromatids cross each other.

Sisters are held together by cohesins and possibly by catenation of centromeric DNA threads, which have been observed in human mitosis.

Cohesion is released in two steps:

  1. on chromosome arms to resolve chiasmata and separate homologs in the first meiotic division.
  2. around centromeres to separate sisters in the second meiotic division.


Cell Division Links: meiosis | mitosis | Lecture - Cell Division and Fertilization | spermatozoa | oocyte | fertilization | zygote | Genetics

Reference

Talbert PB & Henikoff S. (2010). Centromeres convert but don't cross. PLoS Biol. , 8, e1000326. PMID: 20231873 DOI.


Copyright

© 2010 Talbert, Henikoff. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Figure 1. Journal.pbio.1000326.g001.png


Cite this page: Hill, M.A. (2024, May 26) Embryology Chromosome connections in meiosis.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Chromosome_connections_in_meiosis.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current18:27, 27 July 2010Thumbnail for version as of 18:27, 27 July 2010600 × 397 (35 KB)S8600021 (talk | contribs)Chromosome connections in meiosis. Kinetochores attach homologous chromosomes to opposite halves of the spindle. Homologs are held together by chiasmata, in which recombinant chromatids cross each other. Sisters are held together by cohesins and poss

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