[Recombination of amber mutants of bacteriophage T4B. II. Localization of amber mutants on maps of genes 30, 34, 35, 36 and 38].

Localization of 275 amber mutants of five genes of phage T4B (30, 34, 35, 36 and 38) on genetic maps allowed us to determine the recombination length of these genes. Gene 34 substantially differs from the rest studied genes by numbers of amber mutants isolated in each gene and by recombination frequency. In particular, according to the results of crossing the flank markers, the recombination length of gene 34 is 10 times greater than in gene 38; using the summary value of recombination frequencies between elementary intervals a 20-fold excess of the length of gene 34 compared with the length of gene 38 was receieved. Molecular weight of the product of gene 34 is only 6 times as great as in gene 38. An elevated recombination frequency was also detected in gene 35. The data obtained indicate a local recombination anomaly at the region of genes 34--35 of bacteriophage T4 genome.