INHERITANCE OF WHITE-SPOTTING IN RABBITS. 



9 



and so were like the foundation stock. The young thus produced 

 numbered 130 and fall into two distinct groups, each varying about a 

 different mode. The two groups apparently do not overlap. Taking 

 the minimal class, grade 12, as on the line between them, there are 

 65 individuals below this class and 64 above it. The former should be 



No. 

 50- 



40- 



30- 



20- 



10- 





 10- 



10- 



20- 



W 



F,, DxW 



F,,DxW 







Grade, I 



4 5 



7 8 9 10 II 12 13 14 IS 16 17 



TEXT-FIGURE 1. 



heterozygotes like the young recorded in table 22. Their mean grade 

 is very similar, 7.04 as against 7.28. The latter are evidently homozy- 

 gous white like the young of table 19. They have a similar but slightly 

 lower mean grade, viz, 15.56 as against 16.25. This result indicates a 

 1 : 1 segregation of white and dark Dutch and that accordingly white 

 and dark are allelomorphs. If so, an F 2 generation should show 

 a 3 : 1 segregation. To test this point we may summarize from 



