Biology 1002B Lecture Notes - Lecture 24: Operon, Experimental Evolution, Citric Acid
24 Sep 2016
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Characteristics of model systems that can be used for experimental evolution. Most studies of evolution are constrained by two facts: most organisms evolve slowly, cant go back in time to examine ancestral forms. Cant use fossil record because its incomplete. No nothing about ancestors of monkeys and humans. Model systems used for experimental evolution: viruses, bacteria (generation times of minutes to hours, chlamy, drosophila, yeast. They all have short generation times (minutes, hours or days) One is ancestral, the other one will be evolved (2000 generations) (give it different environments to see if it will evolve) classic experimental. Mix the two flasks, and count evolved cells vs. ancestral cells. Let colony grow, with them competing with each other, in the environment the evolved one was living in for 2000 generations. At end, see how many of each there are, to see growth rate of ancestral and evolved.
