A Modification of the Sex Ratio, and of other Ratios, etc. 



339 



rudimentary females. There were 89 long-winged female offspring and 

 3 rudimentary winged male offspring. In several of the further combi- 

 nations these males were used but in the others ordinary or stock 

 males were used which should give the same results, as they did in 

 fact. The F2 classes from the cross were as follows: 

 L 9 1259 L (5 240 Min. 9 o Min. <5 814 Rud. 9 309 Rud. (J 396 Rud.-min. (5 74 



From the analysis on page 330 repeated below it will be seen that 

 the long females are due to one original and one "cross-over" couple, 

 while the long males are due to the cross-over class. If we compare 

 them with the miniature males we find them as i to 3.33. The 

 ratio may be affected by the presence of white in the larger expected 

 class of miniature males. 



Rudimentary 9 • ■ • RmX — RniX 

 Miniature (5 .... rMX — rm 



f RmXrMX Long 9 



\ RmXrm Rudimentary (J 



Fl 



Gametes of Fj 



RMX — RmX — rMX — rmX Eggs 



RmX — rm Sperm 



RMXRmX = Long 9 

 RmXRmX = Rudimentary 9 

 rMXRmX = Long 9 

 rmXKmX = Rudimentary 9 

 RMXrm = Long rj 

 RmXrm = Rudimentary (J 

 rMXrm = Miniature (J 

 rmXrm = Rudimentary-miniature (J 



The heredity of the sex-linked factors for miniature and 

 rudimentary wings combined with the eye-color producer, c. 



Two of the three factors involved, M and R, have figured in the 

 preceding experiments. Combined with them is a third se.x-linked 

 factor, viz., the color producer c (or its absence c). When a male 

 with rudimentary wings (Rm) and red eyes (c) is mated to a female 

 with miniature wings (rM) and white eyes (c), all the female offspring 

 have long wings and red eyes and all the males miniature wings and 

 white eyes. These inbred give in the next generation the following 

 classes: 



Red. I White, 



Lc? L9 M(J M9 R(J R.-m. (?L(5 L9 McJ M9 R(5 R.-m. (J 

 2« 3 965 377 478 344 34 I 56 439 633 824 148 «o 



Intiukcive AbsUmmuiiga- und Vcrcrbuiigslcluc. VII. 33 



