122 SIRKS, THE COLOURFACTORS OF THE SEEDCOAT IN PHASEOLUS 
far it concerns the fatherplant: the segregations in Fo of Bruine 
x Kievits however were of course less complicated, because of 
the presence of the D-factor in both these races, the F,-individuals 
being thus homozygotes for this factor. In these segregations only 
types possessing the brown navelring (types I, II, III, IV and VIII) 
might occur, and from this the fatherplant could be identified as 
a yellowbrown individual in those cases also, that the father was 
unknown. Cultures were made of the descendants of three spon- 
taneous and one artificial hybrid with the Kievits-race as mother and 
one spontaneous and two artificial hybrids that had the yellow- 
brown race as female parent, 
The numbers of segregation may befound in the following table: 
(Cf table page 123) 
The results of these segregations are in rather good harmony with 
the hypotheses given above as being derived from the cross Citroen 
X Kievits; the hybrid between Bruine and Kievits is a trihybrid 
AABbGgKkDD and its segregation will thus show the follo- 
wing groups: 
9 BBGKD F;-type I 3 BBéKD kievits-type IV 
18 Bb GK D F;-type I 6 BbgKD kievits-type IV 
9 bbGKD F,-type I 3 bbgKD kievits-type IV 
3 BBGkD yellowbrown II 1 BBskD Wagenaar-type III 
6 BbGkD yeilowbrown II | 1 BbgkD Wagenaar-type III 
3 bbGkD yellowbrown II 1 bb ¢kD white with brown 
navelring VIII. 
According to this scheme, in a total number of 64 individuals 
in Fy there are belonging to type I 36, II 12, III 3, IV 12 and 
VIIL 1. The proportions derived therefrom for a total number of 
175 may be compared with the observations in this way: 

Type | I | Il | III | IV | Vv | VI vu VIII | Total 
Observed numbers, 92/43) 11 | 28 — — -| 1 175 
Theoretical proportions ZOUT a2 er 1 64 
Expectation 98 33| 8 as ie | — 3 175 





This comparison of the results obtained with the numbers that 
