158 



ROBERT CHAMBERS, JR. 



TABLE XIII. 



RESULTS OF EXPERIMENT VI. CROSSOVERS. 



LR9 X BfWd" 



F 2 



LR9 X LRcf 



The crossing back of the crossovers occurs in approximately the 

 same percentage as did the crossovers to the original combina- 

 tions in Experiment VII. 



The results here harmonize with those of Experiment I. We 

 may legitimately infer that the large classes in the F 2 generation 

 are those with the combinations occurring in the grandparents 

 no matter whether the grandparents have acquired those factors 

 early or late in their phylogenesis. 



EXPERIMENT VII. 

 The results of the reciprocal cross, BfR females by LW males 



is shown in Table XIV. 



TABLE XIV. 



RESULTS OF EXPERIMENT VII. RECIPROCAL OF EXPERIMENT VI. 



BfR 9 X LWcf 



F 1 



LR9 X 



