330 



Morgan. 



Gametes of Fj . 



rMXRmX Long ? 

 rMXrm Miniature cj 

 RMX — rMX • 



rMX ■ 



RmX 

 ■ rm 



rmX Eggs 

 Sperm 



RMXrMX Long 9 



rMXrMX Miniature 9 



RmXrMX Long 9 



rmXrMX Miniature 9 



RMXrm Long (J 



rjrXrm Miniature (J 



RmXrm Rudimentary (5 



rmXrm Rudimentary-miniature (5 



Two classes- of females appear in the Fg generation, viz., long 

 and miniature wings; and four classes of males; these are Miniature, 

 Rudimentary, Long and Rudimentary-miniature. The analysis shows 

 that long wings develop wherever R and M both occur in the same 

 individual. This means obviously that the normal wing has lost one 

 factor when rudimentary wing was produced, and another factor when 

 miniature wing was produced. Each contains, therefore, something 

 that the other lacks, and when the two are brought together long 

 wings result. 



The reciprocal cross, viz., miniature males and rudimentary 

 females, gives in the first generation long females and rudimentary 

 males, and these inbred give the following results: 



Long 9 1259 



., 6 240 

 Rudimentary 9 309 



d 396 



Min. (3 by Rud. 9 



/ Long. 9 89 

 1 Rud. (3 3 



Miniature (J 814 

 Rudimentary-miniature (5 74 



These results are complex in the sense that in some cases white 

 eyes were also involved. The separate classes in these cases will be 

 given on a later page. 



In the first generation there is an extraordinary deficiency of 

 males. The point will be discussed later. The analysis is as follows: 



Rudimentary 9 . • . RmX — RmX 

 Miniature (J rMX — rm 



/ RmXrMX Long 9 



I RmXrm Rudimentary (J 



Qametes of Fj 



RMX — RmX 

 RmX — rm 



rMX — rmX Eggs. 

 Sperm 



