1. Is crossover between the X and Y a regular feature of meiosis in mouse and man?

   • T. Ashley

   OriginalPaper Pages: 161 - 167

2. Genetic variation and differentiation in Armadillidium vulgare (Isopoda: Oniscoidea)

   • M. L. Beck
   • J. O. Price

   OriginalPaper Pages: 169 - 171

3. Genetic variation in a semi-natural Drosophila melanogaster population after a bottleneck II. The relative fitnesses of second chromosomes

   • M. Begon
   • R. Chadburn
   • C. Keill

   OriginalPaper Pages: 173 - 181

4. The inter-relationship between heterochromatin distribution and chiasma distribution

   • B. John
   • M. King

   OriginalPaper Pages: 183 - 194

5. The role of sperm numbers in sperm competition and female remating in Drosophila melanogaster

   • J. T. Letsinger
   • M. H. Gromko

   OriginalPaper Pages: 195 - 202

6. Cytogenetics of New Zealand blackflies of the genus Austrosimulium (Diptera: Simuliidae) II. Heterozygote deficiency and non-random association of inversion heterozygotes

   • M. C. McLea
   • D. M. Lambert

   OriginalPaper Pages: 203 - 211

7. The polytene chromosomes of Nilodorum biroi (Kieffer) (Diptera: Chironomidae)

   • S. Saxena
   • J. Martin
   • C. M. S. Dass

   OriginalPaper Pages: 213 - 221

8. Population genetics of Melampus bidentatus (Gastropoda: Pulmonata): the effect of planktonic development on gene flow

   • S. W. Schaeffer
   • E. C. Keller Jr.
   • N. E. Buroker

   OriginalPaper Pages: 223 - 229

9. Chromosomal homologies of the genera Vespertilio, Plecotus and Barbastella (Chiroptera: Vespertilionidae)

   • M. Volleth

   OriginalPaper Pages: 231 - 236