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Unformatted text preview: ______________________________ ________________________________ Your name Your lab day and room number or TA name BioGD2810 Genetics Fall 2010 Quiz #5 For parts a and b below, indicate the percentage of tetrads that would have 0, 1, 2, 3, or 4 viable spores after Saccharomyces cerevisiae a/ α diploids of the given genotypes are sporulated. (a) (3 points) A true-breeding wild-type strain (with no mutations in any gene essential for viability).---- 1-- 2-- 3 100 4 (b) (3 points) A strain heterozygous for a null (completely inactivating) mutation in a single essential gene.---- 1 100 2-- 3-- 4 For parts c-g, consider crosses between yeast strains of the form a X b , where a and b are both temperature-sensitive mutations in different essential genes. The cross is conducted under permissive (low-temperature) conditions. Indicate the percentage of tetrads that would have 0, 1, 2, 3, or 4 viable spores subsequently measured under restrictive (high- temperature) conditions....
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This note was uploaded on 12/20/2011 for the course BIOGD 6057 taught by Professor Fox during the Spring '09 term at Cornell.
- Spring '09