UNEQUAL BREAKS IN TWO SISTER CHROMATIDS INDUCED BY X-RAYS IN DROSOPHILA MELANOGASTER

Abstract
Cytogenetic analysis of N264-86, obtained from an x-rayed [male], shows 2 strands affected in the x-chromosome. One strand has a deficiency from 3C8 to 3E5, inclusive, and in addition changes in fa and rst loci, while a piece from 3C7 to 3E5, inclusive, is lacking from the other strand and inserted into chromocenter of 4. Thus the right breaks occurred at the same point, while the left breaks occurred at different points but close to each other.