166 CORRELATION OF COLOUR CHARACTERS IN RICE 
(B) The “ pulvinus and auricles ” stick together, giving 9 coloured : 7 
colourless (total 7 families, 1:2: 1). 
_(C) Coloured outer and inner glumes give 3 coloured : 1 colourless 
(total 7 families, 3-1: 1). 
(D) Coloured apiculus gives 15 coloured : 1 colourless (total 7 families, 
14-7 21). 
I. A and B. A segregates 3: 1, B 9: 7. If independent segregation 
takes place, we expect— 
27 AB : 9aB ; 21 Ab: 7 ab 
Observed Soe “ACNE : 0 : 878 202 (7 families of 4,687 
plants) 
The combination of “ coloured pulvinus and auricles” (B) with “ green 
leaf-sheath, internode, stigma ” (a) is not found. 
This case is comparable to previous ones. A is due to a single factor, 
B to a second additional factor interacting with the factor responsible 
for A in sucha way that the presence of both is necessary for the production 
of colour. Thus we get— 
12 A 4a 
aT a 
AB Ab aB : ab 
9 3 : 3 : 1 
ee 
OBS 7b 
or ae 9 AB: SAD) 0) at 4 ab 
Observed woe 25008 : 878 : 0 : 1,202 
Expect en e2nbaGi4s 92 7878281 0 Bale aloe(s) 
II. AandC. A segregates3: 1,C 3: 1. 
Expected ratio SUNG: BSP AN 88} EO 1 ac 
Observed .- 2,666 : 819 : 905 : 297 (7 families of 4,687 
plants) 
Expect .. 2,636°37 : 878:79 : 878:79 : 292-93 
Segregation is independent and according to expectation. 
II. AandD. Asegregates3: 1,D 15: 1,80 expected ratio, if indepen- 
dent segregation takes place , is— 
BACs la 
15°D': ld 
45AD : 15aD : a eAdias 1 ad 
Observed s0 3,480 : 905 a) 2 297 (7 families of 4,687 
plants) 
