82 Studies oj Inheritance in the Japanese Convolvulus 



4. If we denote the one parent by GGDD and the other by ggdd, 

 there exists the interrelation between the factors G and D, inasmuch as 

 in the presence of D the production of the dark-red flower-colour takes 

 place when G is present in homozygous condition, and that of the red 

 (magenta or scarlet ) colour, when G is present in heterozygous condition 

 or altogether absent. The hybrids F^ (= GgDd) will thus bear always 

 flowers of red (= magenta) colour. 



EXPLANATION OF PLATE IL 



Fig. 1. A dark-red flower from the one parent. 



Fig. 2. A white flower from the other. 



Fig. 3. A magenta flower with " hukurin " from the Fi plant. 



Fig. 4. A scarlet flower from a F^ plant. 



Fig. 5. Leaf and a portion of stem from a green plant. 



Fig. 6. Leaf and a portion of stem from a yellow plant. 



All figures are from water-colour drawings by Mr N. Midusima. 



