1. Utilization of somatic cell hybrids for genetic studies in man

   • Karl-Heinz Grzeschik

   Reviews Pages: 1 - 40

2. Genotype and phenotype in human chromosome aberrations and in the minute mutants of Drosophila melanogaster

   • F. Vogel

   Original Investigations Pages: 41 - 56

3. Structural aberrations of the Y chromosome and the corresponding phenotype

   • J. W. Siebers
   • W. Vogel
   • A. Dittrich

   Original Investigations Pages: 57 - 66

4. Seasonal variation in the birth of children with aneuploid chromosome abnormalities

   • J. Nielsen
   • G. Bruun Petersen
   • Eva Zeuthen

   Original Investigations Pages: 67 - 74

5. The local control of mammalian spermatogenesis

   • E. Schleiermacher
   • W. Schmidt

   Original Investigations Pages: 75 - 98

6. The 4p- syndrome, with a report of two new cases

   • J. P. Fryns
   • E. Eggermont
   • H. van den Berghe

   Original Investigations Pages: 99 - 109

7. Ein Selektionsmodell für das Rhesus-Blutgruppensystem

   • G. Flatz
   • H. B. Brinkmann

   Originalarbeiten Pages: 111 - 122

8. A case of 18q- in a family with a translocation t(6p+;18q-), identified by the Giemsa-banding technique

   • W. L. Gouw
   • L. P. ten Kate
   • A. Okken

   Short Communications Pages: 123 - 126

9. Maple syrup urine disease: Rapid prenatal diagnosis by enzyme assay

   • U. Wendel
   • H. W. Rüdiger
   • Margareta Mikkelsen

   Clinical Case Reports Pages: 127 - 128