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Excerpt from Breakage Points for Four Corn Translocation Series and Other Corn Chromosome Aberrations Maintained at the California Institute of Technology: January 1961 The chromosome breaks that unite to produce transmissible translocations are not distributed at random among the 10 chromosomes, among the 20 chromosome arms, nor among the 1011 sections of the 20 arms. This nonrandomness is present regardless of the source of ionizing radiation or the material treated. The highest concentration of breaks is found in the more densely staining areas of the mid -prophase chromosomes. Thus, the concentration of breaks in an arm or a portion of an arm may be a measure of the staining density of the arm or a fraction of the arm. Arms with a uniform staining density over much of their length, whether heavy or light, are affected the same by different types of ionizing radiation. On the other hand, arms with areas staining nonuniformly light and heavy show, with different doses of radiation, variation in position and density of the break bringing about the translocation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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