1. A developmental study of constitutive heterochromatin in Microtus agrestis

   • J. C. Lee
   • Jorge J. Yunis

   OriginalPaper Pages: 237 - 250

2. Chromatin and histones in mealy bug cell explants: activation and decondensation of facultative heterochromatin by a synthetic polyanion

   • Gary Miller
   • Laurence Berlowitz
   • William Regelson

   OriginalPaper Pages: 251 - 261

3. Architecture of the Chinese hamster metaphase chromosome

   • Elton Stubblefield
   • Wayne Wray

   OriginalPaper Pages: 262 - 294

4. Male germ line, spermatogenesis and karyotypes of Heteropeza pygmaea winnertz (Diptera: Cecidomyiidae)

   • Samuel Panelius

   OriginalPaper Pages: 295 - 331

5. Oogenesis and chromosomal heterozygosity in the thelytokous midge, Lundstroemia parthenogenetica (Diptera, Chironomidae)

   • D. L. Porter

   OriginalPaper Pages: 332 - 342