Frequency distribution of the host-range mutant phages (phenotype hc) among individual bacteria infected with T2 phage was investigated for the purpose of analysing the mutation process as well as the mode of intracellular virus multiplication. The distribution of the hc-mutant clones with respect to their sizes was clearly an exponential type indicating that the replication of virus genes proceeds in sucu a way that replica themselves may serve as patterns for additional replications.
