Posted on 06/10/2008 12:07:34 PM PDT by mnehring
Any change in allele frequency in a population is evolution by definition.
The e.coli bacteria cannot break down citric acid. The evolved strain can break down citric acid. This was not an intraspecies variability that was selected for or against - it was an entire trait that was not present but now is (due no doubt to the mutation of a few enzymes that make them now able to break down citric acid when previously they could not).
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