162 CORRELATION OF COLOUR CHARACTERS IN RICE 
common to both, or that, if there are two factors, they must be completely 
inked. We get thus— 
15 A LIED, 
—[—=—s—=<"_— + ~ 
ABs (ab sy Alb ab 
9 3 3 1 
—— ——— 
12B 4b 
or .. I2AB PEG fa ZNO 8 els 
Observed fo HAY anO : 261 : 68 (3 families of 1,199 plants) 
Expect .. 899-04 : 0 3 224-76: 74:92 
The above is a common mode of segregation, occurring frequently in 
many varieties. It is to be noted that the combination which is wanting is one 
which does not occur in the 211 varieties examined (cf. Appendix I). 
Il. AandC. The case is exactly comparable to I, system A segregating 
15:1, system C, 3:1 
AC 7 ac 7 AC > ac 
Observed “ts 907 a 0) : 224 : 68 (1,199 plants, 3 families) 
Expect fs $99: Gavia lO) : 224°:79 : 74:93 
Ratio SC 12 0 5 6S yl 
Again the combination wanting, viz., “ green leaf-sheath and apiculus ” 
(a) with “coloured outer glumes ” (C), is not found in the 211 varieties 
examined. 
Ill. B and C Both segregate 3:1. We therefore expect, if indepen- 
dent segregation is taking place— 
BC : Be 2 bC 290G 
9 : 3 : 3 omeeel 
Observed Hc 648 : 222 : 259 0 (1,199 plants, 3 
families) 
Expect ae 674:37 : 224:°79 :; 224-79 : 74:93 
Segregation is independent and all combinations occur in their expected 
ratios. 
4. Variety Muramagar x Var. Pookhi. 
(A) The system “ leaf-sheath, internode, apiculus and stigma ”’ sticks 
together absolutely, giving 3 coloured : 1 colourless (total 4 
families, 2°6: 1). 
(B) The colour in the ligule segregates 9 coloured : 7 colourless (total 4 
families, 1:2: 1). 
(C) The colour in the outer and inner glumes gives 9 coloured : 7 
colourless (total 4 families, 1:2: 1). 
