Chromosoma

, Volume 56, Issue 3, pp 249–263 | Cite as

Centromere behavior during interphase and meiotic prophase in Allium fistulosum from 3-D, E.M. reconstruction

  • Kathleen Church
  • Peter B. Moens
Article

Abstract

Centromeres at premeiotic interphase are clustered and situated in a small area of the nucleus opposite to the nuclear envelope associated heterochromatic masses. The centromeres may occur singly or they may associate to form a structure composed of 2 or more centromeres. Many centromere associations are nonhomologous. Interphase centromeres are not attached to the nuclear envelope. — At zygotene and pachytene centromeres are no longer clustered at one pole of the nucleus but rather are distributed throughout the nucleus. Premeiotic associations appear to be resolved prior to meiotic pairing. Only homologous centromere associations occur during zygotene and pachytene. There is no indication that premeiotic centromere associations are involved in prezygotene alignment of homologous chromosomes.

Keywords

Developmental Biology Small Area Nuclear Envelope Homologous Chromosome Meiotic Prophase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • Kathleen Church
    • 2
  • Peter B. Moens
    • 1
  1. 1.Department of BiologyYork UniversityDownsviewCanada
  2. 2.Department of ZoologyArizona State UniversityTempeUSA

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