326 



GENETICS OF FUNGI 



H 



H 



Fig. 54. Above. Schematic representation of sex segregation at the first 

 nuclear division in Neurospora sitophila. There result two possible arrange- 

 ments of the ascospores with regard to sex, as shown in H. Either the four 

 spores at the upper end of the ascus are + and the four at the lower end — , 

 or else the fours are in reverse position. (After Dodge.) Below. Schematic 

 representation of sex segregation at the second nuclear division in Neuro- 

 spora sitophila. There result four possible arrangements of ascospores with 



regard to sex, as shown in H. 



