56 



I. NAG.U: 



Table 26. 



Showing the segregation of the offsprings of imperfect black 

 F2 plants. 



iTti 



35 



■ill 



An approximation to a cliliybrid ratio was confirmed by forty sis families 

 raised in the F^ generation. Tlie details are given iu Tables 30 and 35. 



The biifl' is found to be the most recessive character to any other one in 

 the colour characters so far studied. Since the chi'omogenic substance can be 

 detected in the uuiipe, gi'een seed of buife, browns, and blacks, but is nearly 

 absent in A-eUows and greens, and further that yellows and gi-eens are 

 dominant over the former coloiu-s, it must be concluded that an inhibitor for 

 the development of the pigment is present in the green and yellow. 



A mention may be made regarding the brown character. We cau dis- 

 tinguish several browns which differ mora or less in hue and shade but 

 exact discrimination is very difficult. If it is made among the segregates, the 

 lighter shade appears to be domniant over the deeper one. When the distinctly 

 reddish brown such as we see in the seed coat of a variety " Aka-nedzumimo " 

 is crossed with the brown like that we have ah-eady dealt with (" Haiiro "), 

 the reddish brown behaves as a single recessive to brown. The F, seed of 

 the cross " Aka-nedzumime " x " Haiii-o " was brown like that of the ftither 

 which is brown with a gi-eyish gi"een tiuge. In K, reddish l)rowu and 

 brown, regardless of the gi-ean tinge, segi-egated in the following number : 



