Seasonal Cycles and the Concentration of Inversions in Populations of Drosophila funebris

Though the increase in the occurrence of complete synapsis in the X tip of the long translocation as compared with that in the short translocation was not found to be significant, the much greater frequency of partial synapsis found in the X tip of the long translocation is definitely significant. The results are an indication that the pairing of chromosomes is the result of the chance meetings of some homologous loci during random movement of the chromosomes, rather than the result of a long-range attraction between chromomeres. The writer is indebted to Dr. K. S. Brehme for her suggestion of the problem and her guidance throughout the course of its study. MARCIA KELMAN