FLOWER AND SEED COLOUR IN LUPINUS St tks 


158 blue: 48 tinged blue 


expected: 154,5 51, D/M= zee = 0,56 
224 blue: 78 white 4 
expected: 226,5  :75,: D/M= = 0,33 
179 tinged blue: 56 white 
pipecteds AG : 58,75 D/M = Fe = 0,41 
The constant and the segregating families occur in a number, which 
is very near to the theoretical expectation. From 32 blue parent 
plants the result was: 
7 constant blue: 13 9:3:4-segregates : 6 blue and tinged blue : 6 
blue and white families 


expected: 3,56 14,22 eee 7,11 
ee —— 
3,44 1,22 I: 
\ FA = rat tiie, — ; 2 = 5 
D/M Fr 1,93 Im 0,43 Bi 0,58 
10 tinged blue F;-plants gave in F;: 
5 constant tinged blue : 5 tinged blue and white families 
tee 
expected: 3,33 226,67 1D/M= 2 

As seen the mode of segregation in this cross is typical of a synthetic 
cross. It should be noticed, however, that the synthesis does not 
originate through the coming together of a fundamental colour factor 
and the blue colour factors. This combination is realized already in 
the ‘tinged blue parent plant. It is the meeting of the fundamental 
factor with the intensity factor F that makes the synthesis. 
45 blue, 8 tinged blue and 5 white F,-plants have been examined 
as to seed colour; all the blue and the tinged blue had earth-brown 
seeds, and all the whites had white seeds. 
Cross 6 (tables 16—17). 
Violet flower colour, earth-brown seeds X white flowers and seeds. 
RRbbVVFF rrBBVVFF 
F, had blue flowers and earth-brown seeds. In F, we expect, accor- 
ding to the theory, the ratios 9:3: 4. We find: 
