LINKAGE OF THE FACTOR FOR BIFID WING. 



157 



TABLE XI. 



RESULTS OF EXPERIMENT V. THE RECIPROCAL CROSS. (Cf. TABLE IX.) 



The percentage of crossovers is the same as that shown in 

 Table X. and slightly larger than that in the corresponding 

 experiment in Table IX. 



EXPERIMENT VI. 



LW females were mated with BfR males. 



The LR females and LW males of the F 1 generation were 

 allowed to interbreed. Table XII gives the numbers produced 

 in the resulting F 2 generation. The percentage of crossovers is 

 approximately 8. 



TABLE XII. 



RESULTS OF EXPERIMENT VI. 

 LW? X BfRcf 



F 1 



LR9 X LWd" 



The strength of coupling of the new combinations in the cross- 

 overs was determined by mating the crossover BfW males with 

 pure LRd 71 . Table XIII. gives the results of this mating. 



