

^J* 







in the kafir seeds only as small 

 splotches or specks of red-brown. 

 The genetic formula for the 

 two sorghums would then be 

 as follows: For feterita SSbl) and 

 for kafir ssBB. 



If these factors acted inde- 

 pendently Fi would be SsBb, 

 brown seeded with the brown 

 color diffused or spread over the 

 seed coat by the combination 

 of the pigment factor B with 

 the spreading factor S. This 

 conforms to the results obtained 

 since all the seed in the F, was 

 uniformK' brown with the color 

 spread e\enly o\er the seeds, 

 most prominent on the outer or 

 blossom end, but not collected 

 in splotches or specks as it is in 

 kafir. (Fig. 6.) Fj according to 

 the above theory would segre- 

 gate into 9S-B-, 3S-bb, 3ssB- 

 and Issbb. The S-B- represent- 

 ing 56.25 per cent of the total 

 would be brown seeded like the 

 Fi seed ; the S-bb would be white 

 like feterita, the ssB- would be 

 white like kafir with only brown 

 specks, and the ssbb would 

 also be white lacking both the 

 factor for brown pigment and 

 also the S factor. These last 

 three phenotypes all being white 

 make up 43.75 per cent of the 

 total number. 



The results olnained conform 

 in the main \ery closely to this 

 interpretation and are given in 

 Table V. 



INHHRIT.WCE OF COLOR IN THE 

 GLU.MKS 



Red Amber Sorgo X Feterita 

 Red Amber sorgo has uni- 

 formly dark red glumes, while 

 feterita has l)lack glumes. In 

 several crosses where the sorgo 

 was used as the pistillate parent, 

 it was found that the red in 

 the glumes was dominant over 

 the black. The results from 



A SORGO-FETERITA CROSS 



Al)()\c' is sliow n a singU- lu'.ul from an 

 Fi plant of t he cross between Red Amber 

 sorgo and feterita. It will be noted 

 that the head is quite compact in form. 

 The glumes arc red, like those of the 

 sorgo parent. (Fig. 5.) 



