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Chromosoma

, Volume 45, Issue 1, pp 43–62 | Cite as

DNA replication and RNA transcription of euchromatic and heterochromatic chromosome regions during grasshopper meiosis

  • D. P. Fox
  • G. M. Hewitt
  • D. J. Hall
Article

Abstract

The sequence of chromosome replication and the extent of RNA transcription were determined for pre-meiotic S-phase and first meiotic prophase in males of Myrmeleotettix maculatus and Chorthippus parallelus. Some heterochromatic chromosome segments are replicated early in S-phase while others are replicated late. In general, heavily condensed heterochromatic regions of the chromosomes show little or no RNA transcription as defined by 3H-uridine incorporation. Extra (i.e. in excess of 2) M4 autosomes in Ch. parallelus are slightly more condensed (heterochromatic) than their two homologues and this change in coiling behaviour is paralleled by a reduction in the rate of transcription and a change in the time of its replication, more of the DNA being synthesised at the end of S-phase. These findings are discussed in relation to the definition of heterochromatin.

Keywords

Developmental Biology Chromosome Region Chromosome Segment Meiotic Prophase Heterochromatic Region 
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 1974

Authors and Affiliations

  • D. P. Fox
    • 1
    • 2
  • G. M. Hewitt
    • 1
    • 2
  • D. J. Hall
    • 1
    • 2
  1. 1.Department of GeneticsUniversity of AberdeenNorwich
  2. 2.School of Biological SciencesUniversity of East AngliaNorwich

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