360 



GENES MODIFYING NOTCH. 



Table 6. 



mined, because the original stock of Notch was allowed to die out, and 

 the new Notches that have since appeared are not certainly the same 

 Notch. The new Notches so far as tested, appear to be deficiencies. 

 (See Mohr, 0. L., 1919, Genetics, in press.) 



There were two classes in the males where crossing-over occurred 

 between eosin and Notch containing 9+14 = 23 cross-overs (omitting 

 2+2 = 4 double cross-overs discussed above). Dividing these 23 by 

 the total number of males, viz, 1,095, gives 2.1 per cent of crossing- 

 over. If the four questionable individuals are utilized the result is 

 2.4 per cent. 



There were two classes in the males where crossing-over took place 

 between Notch and ruby, containing 33 + 1=34 cross-overs (omitting 

 the four individuals as before) . Dividing, then, 34 by the total number 



