1. Immunofluorescent localization of transcriptional activity on lampbrush chromosomes

   • John Sommerville
   • Catriona Crichton
   • David Malcolm

   OriginalPaper Pages: 99 - 114

2. The products of the “heat-shock” loci of Drosophila hydei

   • N. H. Lubsen
   • P. J. A. Sondermeijer

   OriginalPaper Pages: 115 - 125

3. Co-replication of satellite DNA of Chironomus melanotus with mainband DNA during polytenization

   • M. Steinemann

   OriginalPaper Pages: 127 - 139

4. Conservation and chromosomal localization of DNA satellites in balenopterid whales

   • Ú. Árnason
   • I. F. Purdom
   • K. W. Jones

   OriginalPaper Pages: 141 - 159

5. Replicon properties of chromosomal DNA fibers and the duration of DNA synthesis of sunflower root-tip meristem cells at different temperatures

   • J. Van't Hof
   • C. A. Bjerknes
   • J. H. Clinton

   OriginalPaper Pages: 161 - 171

6. Individual variation of the nucleolus organizer regions in Allium cepa and A. sativum

   • Fabio Maggini
   • Paolo Barsanti
   • Tommaso Marazia

   OriginalPaper Pages: 173 - 183

7. Meiosis in polyhaploid Hordeum: hemizygous ineffective control of diploid-like behaviour in a hexaploid?

   • N. C. Subrahmanyam

   OriginalPaper Pages: 185 - 192

8. Relationships between frequency, localization and errors in chiasma formation in desynaptic rye

   • R. Giraldez
   • J. R. Lacadena

   OriginalPaper Pages: 193 - 204