“…than expected (50%), the wild male or the wild female from which these offsprings were descended was assumed to be infected since the infective agent kills more Curly zygotes than Plum zygotes (Minamori 1967 In the present study, the chromosomes were classified into 3 categories: sensitive (S), In Table 1 noted that the lethal frequency in 1971 was nearly equal to that obtained in the previous year, while the semilethal frequency increased significantly. The frequency of allelism between lethal genes sampled from each collection is shown in Table 2.…”