Saccharomyces_A

B is the mutation dominant or recessive a 7 if a

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Unformatted text preview: hromosome segregation defect was not seen in the diploid and segregated 2 : 2 in the spores of the ascus. a. Why is this evidence that the mutant phenotype is due to an alteration in one gene? b. Is the mutation dominant or recessive? A-7 If a tetraploid a/ a/ / yeast strain was sporulated, what mating type phenotypes would you predict in the asci? A-8 a. Describe the model for the roles of the Mcm1 pro- tein in determining expression in a cells, cells, and a/ diploids. b. What would be the mating phenotype of an mcm1 ? a mcm1 ? a / mcm1 ? Would they be sterile or fertile? A-9 Seven haploid yeast strains auxotrophic for the compound sneezan were isolated. These strains har06584_refA_001-020 11/13/06 09:12 PM Page 19 Problems were mated with each other, and the ability of the resultant a/ diploids to grow on the intermediate compounds dopan, sleepan, and happan are scored here. Growth on sneezan 1 2 1 2 3 4 5 6 7 Growth on dopan 1 2 1 2 3 4 5 6 7 Growth on sleepan 1 2 1 2 3 4 5 6 7 Growth on happan 1 2 1 2 3 4 5 6 7 a. b. 1 2 3 4 5 6 7...
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