radiations alter the Genetic information in the organism which ultimately result in the production of qualitative and quantitative traits of various kind which help in selecting the modified genotypes these modified genotypes either directly useful or these genotypes can be used as parents by recombining the genes which are actually not available in Nature by v c Jayaramaiah Reader in sericulture Department of sericulture Bangalore University Bangalore 560 056 India e-mail:[email protected]