Week3_2Problems

Week3_2Problems - Week 3: Discussion Section Practice...

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Week 3: Discussion Section Practice Problems 1. Each of the colonies on the plates below are numbered. The master plate is rich media plus streptomycin. The replica plates are “drop” plates, meaning they have all possible supplements except the one indicated below the plate. Deduce their genotypes based on the growth on the various replica plates. a) What is the genotype of colony 1? b) What is the genotype of colony 3? c) Which two colonies have the same genotype? 2. a) What is the genotype of colony 1? b) What is the genotype of colony 2? c) What is the genotype of colony 4? 3. Lederberg and Tatum made crosses by mixing pairs of strains. They used a C strain which was arg+met- and and E strain which was arg-met+. However, they did not know whether each of these stains was F-, F+, or Hfr. An example of the type of crosses they performed is shown below. C strain: arg+met- x E strain: arg-met+ arg+met+
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a) What type of cross would give you many exconjugants? For questions 1b and 1c below, select from the following choices:
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This note was uploaded on 09/10/2008 for the course LS 3 taught by Professor Lin during the Summer '06 term at UCLA.

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Week3_2Problems - Week 3: Discussion Section Practice...

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