2eeeEffects cf Radiation (Dr. Belieny) In physical size the gene approaches the dimensicns of the viruses. The reesnblance has prompted severai werkers to refzor to certain viruses as "naked genes", The diameter of @ gene is almost certainly not less than two or more than 10 millimicr or ehout 1/2,500,000¢hs of an incl.. Like the viruses, it has the interesting preperty of self-duplication, Each time & chromosome divides in the process ef cell division, nct only is each gene reduplicated in a very precive manner, but also the genes retain their cheracteristic orccr and arrangement in the chromosomes. There are processes, honever, by wich the order ef genes in the chroriosomes my Vary or can be eltered exnerimentsaliy in several prrecise and predictable ways. hese oreaggsses ere: eretsing over; invers..cnay truntlocetid: and the like. These refci by exporure ae ta ratiation,. We wild be nsefcl te remeccor thet tha mofority «of gine muteticns are recessi Poise aecis tht ietli: 4pieents muct montrcibubse tc sume Ccgene ir erder thet the dependent . rving., det wi the megjosity of gene changes ai netara for which there is no gocd her do net help the individuel or more usually, and in vurying deersec, render it less able te survive then its normal reletives. lLedical men will have no difficulty in understandings thet any chinge in a system as delicately balanced ac thet ina living organism is likely to be for the worse rather than the better. Stations occar normsliy at as yet unknown, sone charc.cte:isticsily iow rete, and from causes Cosmic radiation has been suspectcd, tat there is no rood evidence to indicat e thet this is so. Laboratory orgeni sms bred in rezions where comic radiation is hige in quantity de net show a mitation rate significantly different from that in control crgenisms bred in regions of low amcunts oJ cosmic vadiation.