BIO 3122 Chapter 10: Chp 10 of Text
18 Mar 2018
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Rattlesnakes use a complex system of fangs, muscles, and venom glands to deliver their deadly bites. Bryan fry investigates the evol of this complicated adaptation by analyzing the genes for venom. Richard lenski uses e. coli to observe natural selection taking place in his lab. A novel trait has evolved in some of the bacteria - the bac can eat foods that normal bac of the same strain cannot. Novel trait = traits that arise de novo (not inherited from a common ancestor) w/i a lineage and have no obvious counterparts (homologs) in related lineages. Were eating citrate = used in the standard medium for growing e. coli bc it works as a chelating agent. Could even thrive on citrate alone (no glucose) As lenski"s bac adapted to the lab envt, one lineage evolved a new trait to feed on citrate. As the bac evolved to eat more citrate, they grew to greater numbers and made their flask cloudier.
