384 



GENES MODIFYING NOTCH. 



GYNANDROMORPH; NOTCH EOSIN RUBY. 



In generation SS 11240521114 of selected Notch, an individual was 

 found that was female, red-eyed and Notch wing on one side and 

 male, eosin ruby-eyed and normal wing on the other side of the body. 

 The mother of this fly had an X chromosome containing the gene for 



Fig. 103. 



Notch and the normal allelomorphs of eosin and ruby (viz, red), and 

 another X-chromosome containing the genes for eosin and ruby eye- 

 colors. All of the characters for which these genes stand appear in this 

 individual. An egg containing the Notch-bearing X must have been 

 fertihzed by -a sperm containing the eosin ruby genes. At some time 

 in the early history of one of the segmentation di\isions of a nucleus 

 of this egg, the eosin ruby-bearing X chromosome must have divided 

 normally, while at the same time one daughter chromosome of the 



