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    Sancar, Aziz and Rupp, W.Dean 1979. Cloning of uvrA, lexC and ssb genes of Escherichia coli. Biochemical and Biophysical Research Communications, Vol. 90, Issue. 1, p. 123.


The dominance of exrB over exrB+ in heterodiploids of Escherichia coli*

  • Joseph Greenberg (a1), John Donch (a1) and Leonard Berends (a1)
  • DOI:
  • Published online: 01 April 2009

To test whether exrB, a mutation in Escherichia coli B making this strain sensitive to ultraviolet radiation and unable to divide normally, is dominant to exrB+, merodiploids were constructed by crossing Hfr exrB metA+his × FmalB met A thr proA recA. metA+recombinants were fertile (F′) and sensitive to UV. One of these, F′ exrB proA, was crossed with an FmetA malB thr, selecting for metA+proA+. All such progeny acquiring malB+ were UV-sensitive, fertile and segregated met mal UV-resistant progeny. They were, therefore, meriodiploids, F′ exrB/exrB+. exrB is dominant to exrB+, in which respect it resembles exrA (lex).

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J. Donch & J. Greenberg (1968 b). Genetic analysis of lon mutants of strain K-12 of Escherichia coli. Molecular general Genetics 103, 105115.

J. Donch & J. Greenberg (1974). The effect of lex on UV sensitivity, filament formation and λ induction in lon mutants of Escherichia coli. Molecular general Genetics 128, 277281.

N. B. Ingels , G. T. Daughters & A. Burzio (1968). New design for an automated bacterial colony counter. Review of Scientific Instruments 39, 115119.

B. Low (1968). Formation of merodiploids in matings with a class of rec− recipient strains of Escherichia coli K12. Proceedings of the National Academy of Sciences, Washington60, 160167.

J. A. Wechsler & J. D. Gross (1971). Escherichia coli mutants temperature-sensitive for DNA synthesis. Molecular general Genetics 113, 273284.

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Genetics Research
  • ISSN: 0016-6723
  • EISSN: 1469-5073
  • URL: /core/journals/genetics-research
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