Long-term lab experiment traces a trait's reappearance
Big leaps in evolution are the products of tiny genetic changes accumulated over thousands of generations, a new study shows.
E. coli bacteria growing in a flask in a lab for nearly 25 years have learned to do something no E. coli has done since the Miocene epoch: eat a chemical called citrate in the presence of oxygen. Evolutionary biologists Zachary Blount and Richard Lenski of Michigan State University in East Lansing and their colleagues describe the molecular steps leading to the feat online September 19 in Nature.
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.