334 



Morgan. 



Several attempts were made to mate rudimentary-miniature 

 females (rmXrmX) with miniature males, rMXrm. In eleven cases 

 results were obtained which show that in five of the cases the 

 females were rm in composition. These gave 16 miniature female 

 offspring and no males. The analysis follows: 



Rud.-min. 9 ■ • • • rmX — rraX 



Min. (5 rJIX — rra 



/ rmXrmX Min. 9 



^ ) rmXrm Rud.-min. (J 



, ^ 1 rmX — rMX 



Gametes of F, . . . ; 



I rmX — rm 



IrmXrmX = Rud.-min. 9 

 rMXrmX = Miniature 9 

 IrmXrm = Rud.-min. (J 

 rMXrm = Miniature (5 



In two cases the results showed that the females in question 

 were rudimentary (Rm). These gave 18 long-winged females and no 

 males. In four cases both Rm and rm females must have been present, 

 since 30 long-winged females, 21 miniature females, and one miniature 

 male were produced. This one male is an anomaly and may have 

 been one of the old males left over in the culture. Setting him aside 

 there were 73 females and no males produced. A long-winged female 

 out of Rud. 9 by Min. cf was paired to a miniature male. There 

 were produced: 



L 9 99 L (J 29 Min. 9 104 Min. (J 99 Rud. (5 14 Rud.-min. (J 5 



The result is in accord with the supposition, that, as expected, 

 the Fl long-winged female was heterozygous (RmXrMX). The deficiency 

 of long males must be due in this case to the same cause as in the 

 straight F2 results (from rudimentary by miniature) as explained more 

 fully later. 



