G X 9 



CGGG-l3Qsci 



gggg-TQsci 



G G qq-6Qscl 



ted o 

 in Ta 

 he r i t 

 a he t 

 me n t e 

 o'f th 

 f e r me 

 al lei 

 en t p 

 these 

 of th 

 duce d 

 f e rme 

 by ba 

 en t ; 

 f e rme 

 sis s 

 genes 

 in a 



Fig. 19-1 A Diagram Summarizing the Data Presen- 

 n the Inheritance of Ga 1 a c t os e - Fe rmen t i n g Ability 

 ble 19-2. No exception to standard Mendelian in- 

 ance was found. Thirteen asci were analyzed from 

 erozygous hybrid made by mating a galactose fer- 

 r (G) by a nonfermenter (g); two spores in each 

 ese asci carried the dominant gene controlling 

 ntation of galactose, and two carried the recessive 

 s. A backcross of fermenter to the fermenter par- 

 roduced thirteen asci; all four spores in each of 



asci carried the fermenting gene. A backcross 

 e nonfermenter to the n on f e r men t i n g parent pro- 

 seven asci, each of which contained four non- 

 nting spores. A heterozygous zygote was produced 

 ckcrossing a nonfermenter to the fermenting par- 

 six asci were analyzed and each contained two 

 nting and two n on f e r me n t i n g spores. This analy- 

 hows quite convincingly that in some pedigrees the 



controlling fermentation of galactose may behave 

 regular Mendelian manner. 



19-2 



