In the c. coli long-term evolution experiment, the mutation allowing the e. coli to metabolize citrate occurred in order to help the e. coli grow on citrate. That is, if the e. coli were growing in some other condition, the mutation definitely would not have happened.
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coli long-term evolution experiment, the population of E. coli was placed in a glucose-limited medium with citrate as the only alternative carbon source. This environment selected for mutations that allowed E. coli to utilize citrate for growth. Show more…
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Richard Lenski's long-term E. coli experiments showed that the bacteria could have acquired the new ability to digest citrate via horizontal gene transfer. Each time a new set of bacterial populations was allowed to grow under the same conditions, some citrate-digesting strains evolved. The bacteria that evolved the ability to digest citrate were outcompeted by those feeding on the better food source of glucose. The bacteria required several mutations and large DNA duplication before they were able to digest citrate in the presence of oxygen.
Marisa A.
In the Escherichia coli LTEE, one strain rapidly increased its population size by evolving the ability to use citrate as a carbon source. If citrate had not been present, then __________. a. In the Escherichia coli LTEE, one strain rapidly increased its population size by evolving the ability to use citrate as a carbon source. If citrate had not been present, then __________. b. The mutation allowing the bacteria to use citrate would not have occurred. c. The mutation allowing bacteria to use citrate would still have increased their fitness. d. The mutation allowing bacteria to use citrate would have occurred more rapidly.
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