A cooperative project was set up by the Agricultural Research Service with the California Institute of Technologu shortly before the Bikini bomb was exploded in 1946 ("Operation Crossroads"). The cooperative project has isolated and maintained a large number of trnslocations and other chromosomal rearrangements from corn material treated with ionizing radiations. The cooperative arragement is now being terminated after 13 years of intensive study. Dr. E. G. Aderson of the Institute is preparing the translocation and inversion stocks for a seed pool that can be drawn from by corn geneticists and cytogeneticists as needs for these radiation-induced markers materialize. Each translocation and inversion stock is characterized by certain cytological features. These features pertain to the chromosome or chromosomes involved and the position of the breakages induced by the various ionizing radiations. An accurate placement of beakage points is the aim in cytological studies involving translocations and inversions.

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