1. The segregation distortion (SD) phenomenon in wild populations of Drosophila melanogaster: interaction between chromosomes 3 and SD chromosomes 2

   • R. Cicchetti
   • G. Argentin
   • B. Nicoletti

   OriginalPaper Pages: 77 - 84

2. Chromosome inversions in Indian Drosophila melanogaster

   • A. Das
   • B. N. Singh

   OriginalPaper Pages: 85 - 88

3. A comparative study of male meiosis in Drosophila melanogaster and D. virilis

   • I. Klasterska
   • C. Ramel

   OriginalPaper Pages: 89 - 98

4. Comparison of the polytene chromosomes of the salivary gland, the fat body and the midgut nuclei of Drosophila auraria

   • P. Mavragani-Tsipidou
   • Z. G. Scouras
   • C. D. Kastritsis

   OriginalPaper Pages: 99 - 108

5. Polymorphism in Cepaea Hortensis in marginal populations in Spain

   • L. I. Mazon
   • A. Vicario
   • C. M. Lostao

   OriginalPaper Pages: 109 - 115

6. Distribution of a supernumerary chromosome system and aspects of karyotypic evolution in the genus Prochilodus (Pisces, Prochilodontidae)

   • E. Pauls
   • L. A. C. Bertollo

   OriginalPaper Pages: 117 - 123

7. Serine esterases: structural conservation during animal evolution and variability in enzymic properties in the genus Drosophila

   • J. Pen
   • G. J. Bolks
   • J. J. Beintema

   OriginalPaper Pages: 125 - 131

8. Genetic variability in Muscari comosum L. (Liliaceae) IV Geographical distribution and adaptive role of the polymorphic variants of chromosome 2

   • C. Ruiz Rejón
   • R. Lozano
   • M. Ruiz Rejón

   OriginalPaper Pages: 133 - 142

9. Allozyme variation among and within eleven Orchis species (fam. Orchidaceae), with special reference to hybridizing aptitude

   • R. Scacchi
   • G. De Angelis
   • P. Lanzara

   OriginalPaper Pages: 143 - 150

10. Book reviews

    • Anne Roy
    • François M. Catzéflis
    • Sebastiano Salvidio

    BookReview Pages: 151 - 156