1. The geographical pattern of an enzyme polymorphism in D. melanogaster

   • D. A. Hickey

   OriginalPaper Pages: 1 - 4

2. Genetics of anthocyanin formation in petals of the Red Campion (Silene dioica (L) Clairv.)

   • J. Kamsteeg
   • J. van Brederode
   • G. van Nigtevecht

   OriginalPaper Pages: 5 - 13

3. Prophase of plant meiosis: Sequences and interpretation of stages

   • I. Klášterská
   • C. Ramel

   OriginalPaper Pages: 15 - 20

4. The effect of rye B-chromosomes on meiotic stability of rye-wheat hybrids in normal, nulli 5B and nulli 5D background

   • M. G. Neijzing
   • W. S. Viegas

   OriginalPaper Pages: 21 - 26

5. Study of some factors maintaining the ‘atrophie gonadique’ character in experimental populations of Drosophila melanogaster

   • G. Periquet

   OriginalPaper Pages: 27 - 32

6. Maintenance of the ‘atrophie gonadique’ character in Drosophila melanogaster: Theoretical models for natural and experimental evolution

   • G. Périquet

   OriginalPaper Pages: 33 - 43

7. Changes in genetic background under selection influencing the expression of self-incompatibility in Brassica campestris var. brown sarson

   • J. R. Sharma
   • B. R. Murty

   OriginalPaper Pages: 45 - 53

8. A salivary chromosome map of Drosophila andamanensis Gupta & Ray-Chaudhuri

   • B. K. Singh
   • J. P. Gupta

   BriefCommunication Pages: 55 - 57

9. Temperature and density effects on fitness at the Mdh-2 and Pgm-1 loci of Drosophila pseudoobscura

   • T. P. Snyder
   • F. J. Ayala

   OriginalPaper Pages: 59 - 67

10. The effect of B-chromosomes of rye on chiasma frequency in Triticum aestivum

    • W. S. Viegas

    OriginalPaper Pages: 69 - 75

11. Corrigendum

    • D. J. Finney

    Erratum Pages: 77 - 77

12. Book review

    • J. P. M. Geraedts

    BookReview Pages: 79 - 79