1887

Abstract

The generalized transducing phage Pf 16h2 has been used to confirm linkage relationships of chromosomal markers of previously determined from their time-of-entry in Hfr crosses, and to map new auxotrophic mutations. By means of spot matings using Hfr donors of known origin of transfer, catabolic markers forming part of a closely linked group of operons referred to as a superoperonic cluster have been shown to be chromosomally located and their map positions determined. R-prime-mediated interspecific complementation has been used to equate functionally 21 auxotrophic loci in . and . and the distribution of these loci on the two genetic maps has been compared. While both maps reveal that auxotrophic markers are largely restricted to about 40% of the chromosome and that auxotrophic markers of similar phenotype are not clustered, there is evidence of at least seven chromosomal rearrangements since divergence from a presumed common ancestor.

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1985-04-01
2024-04-25
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