The dominance ofexrBoverexrB+in heterodiploids ofEscherichia coli
- 1 February 1975
- journal article
- research article
- Published by Hindawi Limited in Genetics Research
- Vol. 25 (1) , 39-44
- https://doi.org/10.1017/s001667230001541x
Abstract
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 × F−malB met A thr proA recA. metA+recombinants were fertile (F′) and sensitive to UV. One of these, F′ exrB proA, was crossed with an F−metA 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).Keywords
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