GENES MODIFYING NOTCH. 



385 



other X (the Notch-bearing chromosome) must have lagged behind at 

 some division, with the result that one cell got both X's and the other 

 cell only one X. 



In consequence of such a process of chromatin elimination we ex- 

 pect one part of the individual to be male as well as eosin ruby and the 



FIQ. 104. 



Fio. 105. 



other part female, red-eyed and notched. An examination of Plate 

 4, figure 2 shows that the right side is female, as seen in the wings, the 

 eye, and the foreleg (absence of sex-comb), and that the left side 

 is male, as seen in the size of the wing, color of eye, and sex-comb. This 

 gynandromorph is not, however, strictly bilateral, for the upper posterior 

 corner of the light-colored eye is red, while the tip of the abdomen, 



