1. Comparison of the nuclear ribosomal units of five Chlamydomonas species

   • Yves Marco
   • Jean-David Rochaix

   OriginalPaper Pages: 629 - 640

2. Double-stranded DNA with the size expected of replicons can be released from Chironomus polytene chromosomes

   • Ulf Lönn

   OriginalPaper Pages: 641 - 653

3. Localization and characterization of rDNA in Drosophila tumiditarsus

   • Ralph M. Sinibaldi
   • Michael R. Cummings

   OriginalPaper Pages: 655 - 671

4. The distribution of repetitive DNAs between regular and supernumerary chromosomes in Species of Glossina (Tsetse): a two-step process in the origin of supernumeraries

   • Amanda Amos
   • Gabriel Dover

   OriginalPaper Pages: 673 - 690

5. DNA extraction during giemsa differentiation of chromatids singly and doubly substituted with BrdU

   • L. M. Webber
   • J. M. Brasch
   • D. R. Smyth

   OriginalPaper Pages: 691 - 700

6. Presynaptic chromosome behavior in Lilium

   • Franc E. Del Fosse
   • Kathleen Church

   OriginalPaper Pages: 701 - 716

7. A search for the synaptic adjustment phenomenon in maize

   • Marjorie P. Maguire

   OriginalPaper Pages: 717 - 725

8. Meiotic segregation of five different reciprocal translocations in the onion fly, Hylemya antiqua (Meigen)

   • L. Vosselman

   OriginalPaper Pages: 727 - 738

9. Errata

   • C. Rodriguez Alfageme
   • G. F. Rudkin
   • L. H. Cohen

   Erratum Pages: 739 - 739