Abstract
Break points have been mapped for a group of 51 Y chromosome fragments induced in irradiated Drosophila melanogaster females. Fragments arising by exchange with the right arm of chromosome 4(4R) have the breakages clustered in the long arm of the Y (Y L ) proximal to the most distal male-fertility locus, and proximal to the cubitus interruptus locus in 4R. Fragments arising by other exchanges have the breakages clustered toward the ends of the Y, usually distal to the most distal male-fertility loci of either arm of the Y. It is suggested that specific, relatively short regions are regularly associated to form “sites” within which the induction of exchange is possible.
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