1. Structural modifications of the mitotic apparatus during the early cleavages in sand dollar eggs

   • Hans A. Went

   OriginalPaper Pages: 219 - 242

2. Cromosomes of the horse, the donkey, and the mule

   • José M. Trujillo
   • Christina Stenius
   • Susumu Ohno

   OriginalPaper Pages: 243 - 248

3. A supernumerary chromosome with an accumulation mechanism in the lecanoid genetic system

   • Uzi Nur

   OriginalPaper Pages: 249 - 271

4. The fine structure of chromosomes in pigeon spermatocytes

   • B. R. Nebel
   • E. M. Coulon

   OriginalPaper Pages: 272 - 291

5. Enzyme effects on pachytene chromosomes of the male pigeon evaluated with the electron microscope

   • B. R. Nebel
   • E. M. Coulon

   OriginalPaper Pages: 292 - 299

6. Variation of the chromosome phenotype in zea, solanum and salvia

   • A. Lima-de-Faria
   • Patricia Sarvella

   OriginalPaper Pages: 300 - 314

7. The role of telomeres at anaphase

   • A. Lima-de-Faria
   • S. Bose

   OriginalPaper Pages: 315 - 327

8. Comparison of chromosome size in species of anemone and their hybrids

   • Margaret Heimburger

   OriginalPaper Pages: 328 - 340