Keim gm “ActPaieg Nature operates in such a way that the probability of any one now living secing hereditary changes which may have been induced during the atomic bomb explosions in Japan is elpost nil. So said Dr. Albert “. Bellamy, professor of zoology and divisional deen of life sciences in the University of California at Los Angeles, during « talk given at U.C.LeA. today (Friday, August 13) in a course onthe Application of Nuclear Physics to the Biological and Medical Sciendes. Various dire oredictdons that mutetions induced by radiation released by the somb detonations would alter the genetic structure of thc Japanese population must be sone@icered in the light of the essential data, said Br. Bellamy. No monsters heave been observed as a result of the explosions and it is nighly AmprobAlye thet any ever will be. The majority of gsne mutations are recessive in cheracter,s.ich mesns that teth psrents must contribute the same gene in order that the reseasive characteristic may develop in the offspring. as (1) lethal The chenges are transmitted churecters which are futal to the offspring and very difficult to detect, en@ (2) as visible recessive charecters, which involve eye color, fveble mindedness, hesoohclia, ste., and occur about 13 tices less frejuently than the lethals. Therefore, the siow disssmination of a populcticn by the transmission of lethal churacters would be mere likely to occur than any sudden and widespread outcropping of monstrosities. Although genetic changes which may have been brought about by ato-ic bomb radiation hve not yet been observed and would not be in any case for some time to coma, what might happen many gencrations later could be 4 very different story, said Dr, Bellamy. “hile little data permitting of sound interpretation exists concerning the gcnetic effects of radiation upon man, it is ~ell known that the mutation rates laboratory pl-nts and animals sre easily altered by exposing chromosomes (microscopic in