BICD 100 - Week 9 section problems - Two problems will be...

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Two problems will be presented on Monday’s (3/9) section: Question 8 (4 points. Two parts a,b) – from Fall 2004 Practice Final A culture of bacteria is grown from a single phage-sensitive bacterium. When a sample of the culture is plated onto agar plates that contain phage, almost all cells are killed by the phage, but a few survive and grow up into colonies. The survivors have a new mutation making them phage resistant. Luria and Delbruck did an experiment to find out if these mutations occurred by chance in the liquid culture at some time previous to the exposure to the phage. a) Below is reproduced some of their data from 4 different repeats of their experiment. In each experiment they grew up 8 small cultures starting from phage-sensitive bacteria, plated each separate culture onto plates containing phage, and analyzed the number of phage resistant colonies. Number of Phage Resistant Colonies A B C D Culture No.
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