24 INHERITANCE OF SOME CHARACTERS IN WHEAT. 



resulting harvest examined. These plants gave rise in the F 3 to the 

 following classes : — 



1. Cultures in which plants with reel and white grain occur- 



red in the ratio 15 : 1. 



2. Cultures in which plants with red and white grain occur- 



red in the ratio 3:1. 



3. Cultures in which all the plants had red grain, the red 



colour being uniform. 



4. Cultures in which all the plants were red grained, but the 



red colour was not uniform in tone. 



5. Cultures in which all the plants were white grained. 

 The presence of two independent red factors, indicated by the 



ratio obtained in the F 2 , was therefore confirmed by the behaviour 

 of these plants in the F 3 . 



Representing the two red factors by Rj and R_> we therefore get 

 the following scheme : — 

 Parents H| B 3 X r 1 r 3 



F, R, r, R 2 r, 



I 

 F 2 Rj R, R 9 R, + r 2 r, r a r 9 + R t R, r 9 r 3 + r, r, R a R a + 2 R 2 r, R, R 9 

 + 2 R, R t R 9 r,. 2 R, r, r 3 r fl + 2 rj r, R 9 v, + 4 R, r, R 2 r a 



The appearance and mode of inheritance in these 9 classes are 

 given in the following table : — 



