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A COMPARISON OF TWO-POINT, THREE-POINT AND DELETION MAPPING IN THE C CISTRON OF RHIZOBIOPHAGE 16–3, WITH AN EXPLANATION FOR THE RECOMBINATION PATTERN
László Orosz 1, Katalin Rostás 1, and Rollin D. Hotchkiss 2
1 Attila József University, Department of Genetics, H-6726 Szeged, Középfasor 52, Hungary
2 The Rockefeller University, New York, New York 10021
A general tendency for additivity prevailed in recombination frequencies for two-point fine-structure mapping of 14 mutants in the C cistron of Rhizobium meliloti phage 16–3, with little evidence of any marker effect. Intracistronic three-point mapping indicated that double crossovers are rare. Deletion mapping indicated that the two- and three-point mapping data gave the correct order of the mutations. A high frequency (5 to 8%) of c/c+ heterozygotic phage progenies was observed in standard crosses. This pattern implies formation of a relatively long region of heterozygosity. Together with the results of the three-point tests, it suggests certain properties of the branch migration and resolution steps envisioned in current mechanisms of recombination.
Submitted on October 17, 1978Revised on August 31, 1979
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