8 Inheritance in the Japanese Convolvulus. Part II 



This Table shews that the ratio scarlet : deep scarlet : dark-red : deep 

 dark-red is 6 : 2 : 3 : 1 in green plants and also, that scarlet : deep scarlet 

 is .3:1 in yellow plants. Accordingly the genetic constitution of the 

 plant used must have been GgDDbbMm. 



5. Green plant with light dark-red floiver. 

 The results are indicated in Table IX. 



From the above Table we see that the ratio light dark-red : dark- 

 red : white is 2 : 1 : 1. Let us now consider what should be the genetic 

 constitution of the plant used. From the explanation of the results in 

 F2 (Table II) we know that there should be six different genetic con- 

 stitutions in plants with light dark-red flowers. But our hypothesis 

 assumes that when G is in homozygous condition in the presence of D, 

 the effect of B is not manifest, so that in this case, the result is quite 

 the same, whether B is present as BB, Bb or bb. Consequently, the 

 genetic constitution of the four families above mentioned must corre- 

 spond to either one of GGDdBBMM, GGDdBbMM or GGDdbbMM; 

 and in order to determine which of these three is the actual one, the 

 hybridisation experiments with other families would be necessary. 



6. Yellow plant with light magenta flower. 

 The results are indicated in Table X. 



From the above Table it is quite evident that the ratio light 

 magenta : magenta : light scarlet : scarlet : white is 6 : 3 : 2 : 1 : 4, so that the 

 genetic constitution of the plant used must have been ggDdBbMM. 



