1. Interference by recessive lethals in the re-isolation of a translocation homozygote inAedes aegypti

   • D. K. Uppal
   • C. F. Curtis

   OriginalPaper Pages: 53 - 60

2. Negentropy and population mean fitness in genetical systems

   • V. Arunachalam

   OriginalPaper Pages: 61 - 67

3. Efficiency of selective breeding based on a phenotypic index

   • Prem Narain
   • A. K. Mishra

   OriginalPaper Pages: 69 - 76

4. Book reviews

   • Ramesh Maheshwari
   • T. Ramakrishnan

   BookReview Pages: 77 - 80