78 Studies of Inheritance in the Japanese Convolvulus 



The offspring derived from these F^ plants were studied in order to 

 ascertain, whether the production of the Fo. plants with the above 

 mentioned genotypic constitutions has been realised. 



In the families containing plants which always produce white 

 flowers, Table XI shews that a corresponds to the formula GGdd, 

 y8 to ggdd and 7 to Ggdd. 



We could get no family corresponding to the formula GGDD in F^, 

 though we had some (cf. Table XIV) corresponding to the formula 

 GGDd. It will be noticed here that notwithstanding the fact that 

 there should be theoretically one GGDD and two GGDd in F^ we had 

 seven GGDd and none of GGDD, but this may perhaps be merely a 

 matter of chance and without special meaning. 



The results in respect to the plants of other genotypic constitutions 

 are as follows : 



Table XVI corresponds to GgDd. 

 ,, XV „ „ GgDD. 



,, XII „ „ ggDD. 



„ XIII „ „ ggDd. 



Thus all results secured in ^3 progenies are fairly well in accordance 

 with the theroetical expectation, except GGDD. 



Furthermore, let us examine the results in F^ to see whether or not 

 our expectation is fulfilled. First of all, we have the families corre- 

 sponding to GGDD in Table XX (c?), and other families are similar 

 to those in F^, It will be noticed also here that we have had no single 

 constant family containing green plants with red flowers till we have 

 attained the F^ generation, and moreover, according to our theoretical 

 expectation it should appear neither in F^^ nor F^. This fact alone 

 suffices perhaps to confirm our hypothesis above mentioned that in the 

 presence of the factor D,G will produce dark-red colour in its homozygous 

 and red colour in its heterozygous condition. 



Next I will pass on to the results of back -crossing. According to 

 our theory the ratio of plants with dark-red and red flowers in F^y. B 

 should be 1:1, and this was really the case, as will be seen in 

 Table XXII. In i^i x J. there should be no plant with dark -red flowerg, 

 and this is really the fact, as will be seen in Table XXI. Thus 

 again the results of back-crosses are in perfect accordance with our 

 expectation. 



Further, I have made various crosses between some of the F^ indi- 

 viduals to each other, and also between them and either one of the 



