| 
: FLOWER AND SEED COLOUR IN LUPINUS hy, 

Cross 9 (tables 22—24). 
Bluish red flowers, earth-brown seeds (RRBBvvFF) X ‘ Violet 
flowers, rust-brown seeds (RRbbVVFF). 
F, Blue flowers, earth-brown seeds. 
The deviations from expectation in F, are great also in this cross. 
All the expected phenotypes are present, it is true, and pure red is 
obtained for the first time, but the ratio 9: 3:3: 1 is greatly deformed. 
It is clear that the deviation is due to disturbances in the gametic 
representation in the shape of repulsion. It should be mentioned that 

Reference 

TABEE 1 
; | | Fées of RS |S. 5 sg Me 2 | 
Ÿ | types LE © = | ESS Ss 
1 Generation ET Top “Pe 48 Lg) Standard 3 a re: 23 
= | (sa ECS Be error | Ss ratio Oo © 
a BV) DV Bo bu | 6) a5 = “85 5% 
| RT |e fe & M |235 Sa 
| | | | | | 
bla lalals 6 EOS 9 | 10 
Repulsion. 
Tl EE ae | 556, 269) 226) 15 1066) 0.7587 | 40.0587 | One |1:3.1:3.1:1| 244 
2 F, Se 540) 542 20 2244) 0.8090 | +0.0153 | 0.8305 | 1 : 39 : 3.9: 1 | 20.4 
‘Sees Fa Era a ae cen ON 
a oad ae u 11707, 817| 771) 35 13330) 0.8248 | + 0.0285 | 0.8233 |1:3.5:3.8:1| 208 
Coupling. 
Fa A 1241| 28 | 30 | 62 1361|] 0.8935 | + 0.0301 | 0.8935 | 47: 1:1:4.7| 17.6 | 
6 | F, 204. 28 | 32-| 33 | 297 0.7651 | + 0.0663 0.7656 | 3.415 b Sox's 20.0 
7, F,+F, |445| 56 | 62 | 95 1658. O.sis2 | +0.0303 | 0.8510 |39:1:1:3.9| 20.4 







there is a remarkably great number of recessives in the family 597 
—18 (table 22), and the segregation agrees with the proportions 
9:3:3:1. The number of individuals, however, is not large enough 
to substantiate the view that the type of segregation differs from the 
type characteristic of the rest of the families, and this is not either 
to be expected. Unfortunately no seed could be obtained from this 
family, and therefore no F,-generation could be raised. 
From the result of the segregation it is seen at once that the ga- 
metic frequency is about 1:3 or 1:4. In order to arrive at an 
accurate determination of the ratio the method ofCorLixs and BRIDGES 
(Corrıns 1912, Bripces 1914) was adopted. The association coefficient 
(Yute’sass.) of the segregating ratios obtained has thus been calcula- 


