1. B chromosome variation in Euphydryas colon (Lepidoptera: Nymphalidae)

   • F. Kay Pearse
   • Paul R. Ehrlich

   OriginalPaper Pages: 263 - 274

2. Chromosome breakage and rejoining of sister chromatids in Bloom's syndrome

   • Evelyn Meyer Kuhn
   • Eeva Therman

   OriginalPaper Pages: 275 - 286

3. A disruption of pachytene DNA metabolism in male mice with chromosomally-derived sterility

   • Y. Hotta
   • A. C. Chandley
   • C. V. Beechey

   OriginalPaper Pages: 287 - 300

4. Characterization of human chromosomal unit fibers

   • Poul Bak
   • Arne Leth Bak
   • Jesper Zeuthen

   OriginalPaper Pages: 301 - 315

5. Chromosomal unit fibers in Drosophila

   • Jesper Zeuthen
   • Poul Bak
   • Arne Leth Bak

   OriginalPaper Pages: 317 - 326

6. Detection and location of three simple sequence DNAs in polytene chromosomes from virilis group species of Drosophila

   • Edward H. Cohen
   • Susan C. Bowman

   OriginalPaper Pages: 327 - 355

7. In vivo effects of γ-irradiation on the functional architecture of the lampbrush chromosomes in Pleurodeles (Amphibia, Urodela)

   • M. T. Loones

   OriginalPaper Pages: 357 - 368

8. Association of the extra chromosome of tertiary trisomic male mice with the sex chromosomes during first meiotic prophase, and its significance for impairment of spermatogenesis

   • P. de Boer
   • H. E. B. Branje

   OriginalPaper Pages: 369 - 379