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P22 and P221 DNA were labeled with (3)H-thymidine and hybridized with P22 DNA, P221 DNA, or Fels 1 DNA immobilized on Millipore membrane filters. With this technique, 31% of the P22 genome was computed to be homologous to the P221 genome. Since the molecular weight of P22 DNA is 2.65 x 10(7) daltons, the homologous region between P22 and P221 should be equivalent to about 8.2 x 10(6) daltons and contain 13,300 nucleotide pairs or about 4400 triplets. Moreover, 46% of the P221 genome was computed to be homologous to the P22 genome. Therefore, the molecular weight of P221 DNA was calculated to be about 1.80 x 10(7) daltons. Sucrose gradient centrifugation showed that the molecular weight of P221 DNA was 2.01 x 10(7) daltons. Thus, the P221 genome is about 25 to 30% smaller than the P22 genome. Further-more, 54% of the P221 genome was found to be homologous to the Fels 1 genome. However, the labeled P22 DNA hybridized with Fels 1 DNA was about 2% of the labeled P22 DNA hybridized with P22 DNA.

proceedings of the national academy of sciences of the united states of america

Genetic Evolution of Bacteriophage, II. Physical Length of the Homologous Region in a Hybrid between Serologically and Morphologically Unrelated Phages