26-31 



THE YEAST CELl 



Distribution of 56 <^ 

 g cultures were all 

 Qq offspring presuaa 

 proved to be a hybri 

 cal markers. The pa 

 cated by the serial 

 ber of asci of each 

 the total in the fin 

 viable spares are in 

 G G and 1 G G G g te 

 6058* 609 is a G cl 

 formation of g to G 



Table 26-16 



sci obtained from G x g hybrids. The 

 descended from g^ parents and their 

 bly arose from tnem. Each ascus was 

 d by use of from 5 to S other geneti- 

 rents used for each mating are indi- 

 numbers heading the columns. The num- 

 type is indicated in each column and 

 al column. Only asci producing four 

 eluded. It is significant that 4 G G 

 trads occur from the mating ^0$ x 

 one from a pedigree in which trans~ 

 occurs frequently ( Lindegren, 19'^9)» 



fermenters. Therefore, mutability from g to G is a heritable 

 characteristic derived from the original gg culture used as a par- 

 ent in this pedigree. 



NON-MENDELIAN SEGREGATIONS 



There were numerous indications of non-Mendelian segrega- 

 tions among these asci. If we characterize g and gg cultures as 

 g (which they are at the time of segregation) the following tabula- 

 tion summarizes the irregular segregation of the G and g alleles 

 in Tables 26-15 and 26-16. 



