48 A MANUAL OF MENDELISM 



The greys and blacks should be of the following 

 constitutions : 



Grey, pure, YC 



YC 

 Grey, hybrid in Y, YC 



yc 



Grey, hybrid in C, YC 



Yc 

 Grey, hybrid in both Y and C, YC 



yc 



Black, pure, yC 



yC 



Black, hybrid in C, yC 



yc 



Mated with each of these coloured kinds, the three 

 albinos should produce the following assemblages of 

 progeny : 



with Grey, Grey, Grey, Grey, Black, Black, 



pure hybrid hybrid hybrid pure hybrid 



gr. bl. al. gr. bl. al. gr. bl. al. gr. bl. al. gr. bl. al. gr. bl. al 



Albino No. 1, 

 pure, should 

 produce : — all : : ; all : : ; 1:0:1; 1:0:1; all : : ; 1:0:1 



Albino No. 1, 

 hybrid in Y, 

 should pro- 

 duce:— all:0:0; 3:1:0; 1:0:1; 3:1:4; 1:1:0; 2:2:4 



Albino No. 2 

 should pro- 

 duce :— all : : ; 1 : 1 : ; 1 : : 1 ; 2 : 2 : 4 ; : all : ; : 2 : 2 



Not devised for such a test, Mr. Hurst's experiments 

 cannot be expected to afford examples of all the possible 



