1. The role of frequency-dependent selection in the outcome of experimental populations in evolution

   • D. Anxolabéhère
   • G. Périquet

   OriginalPaper Pages: 3 - 9

2. Effects of selection for resistance to organophosphorus insecticides on two esterase loci in Drosophila melanogaster

   • A. Z. El-Abidin Salam
   • W. Pinsker

   OriginalPaper Pages: 11 - 14

3. Inheritance of pink body colouration in cichlasoma nigrofasciatum günther (pisces, cichlidae)

   • J. Itzkovich
   • S. Rothbard
   • G. Hulata

   OriginalPaper Pages: 15 - 16

4. On the mode of selection in escherichia coli

   • Kazuhiko Kosuda

   OriginalPaper Pages: 17 - 21

5. A study on the inheritance of the transverse cephalic curvature index

   • S. Mathew

   OriginalPaper Pages: 23 - 26

6. The sheltering of lethals on metatherian sex chromosomes

   • O. Mayo

   OriginalPaper Pages: 27 - 31

7. Estimation of effective generation interval in Drosophila population cages

   • W. M. Muir
   • A. E. Bell

   OriginalPaper Pages: 33 - 37

8. A third hypotrichosis in the domestic cat

   • R. Robinson

   OriginalPaper Pages: 39 - 40

9. Cat gene frequencies in cities of the U.S.S.R.

   • R. Robinson
   • G. B. Manchenko

   OriginalPaper Pages: 41 - 46

10. A comparison of intra-and inter-gene recombination in the meiotic mutant c(3)G of drosophila melanogaster

    • S. K. Sen
    • S. K. Hazra
    • R. S. Banerjee

    OriginalPaper Pages: 47 - 49

11. Chromosome numbers and karyotypic evolution of Caraboidea

    • J. Serrano

    OriginalPaper Pages: 51 - 60

12. Effects of gamma irradiation and pyronin-Y treatments on meiotic recombination in tomato

    • C. B. Singh

    OriginalPaper Pages: 61 - 65

13. Enzyme variation in the brook lamprey, Lampetra planeri (Bloch), a member of the vertebrate group Agnatha

    • R. D. Ward
    • B. J. McAndrew
    • G. P. Wallis

    OriginalPaper Pages: 67 - 73

14. A comparative study of enzyme activity variation between α-glycerophosphate and alcoholdehydrogenases in Drosophila melanogaster

    • Patricia G. Wilson
    • John F. McDonald

    OriginalPaper Pages: 75 - 79