22-29 



THE YEAST CELL 



Table 22^6 

 Occurrence of Mutants in Pantothenate-F ree Medium 



Experiment I 



(Culture III) 



Experiment II 



(Culture III) 



No. cells 



No. mutants 



days 



23 days 



No. cells 



Jo. mutants 



17 days 



28 days 



1.98 X 10 

 1.87 X 10 

 1.54 X 10 

 2.13 X 10 

 1 .77 X 10 

 1.11 X 10 

 1.46 X 10 



1.77 X 10 

 1.60 X 10 

 4.17 X 10 

 1.35 X 10 



Experiment III (Culture Ii; 



Mutation rate = 1.55 x 10' per cell per generation. 



