G. P. HECTOR ; 165 
(B) Colour in outer and inner glumes gives 3 coloured : 1 colourless 
(992 plants gave 3: 1). 
(C) Colour in the apiculus gives 15: 1 (992 plants gave 20: 1). 
I. Aand B. A segregates 3: 1, B3: 1. If independent segregation 
takes place, we expect— 
SVAB =: 3 Ab: 3 aB ; 1 ab 
Observed ys 535 : 196 5 ANE : 46 (992 plants) 
Expect a 558 : 186 : 186 : 62 
Segregation is independent according to expectation. 
If. AandC. A segregates 3: 1,C15:1. If independent segregation 
takes place, the expected ratio is— 
3 A : lige 
15 C : le = 
45 AC ;: 15.aC : 3 Ac ee alpeye 
Observed ee 731 : 215 sail) : 46 (992 plants) 
The combination of “ green apiculus ” (c) with “‘ coloured leaf-sheath, 
internode and stigma ” (A) is net found. As in former cases of the sort, A 
is due to a single factor, C to a second factor interacting with the factor 
responsible for A in such a way that either or both produces colour. Thus 
12 A = 4a 
AC Ac aC ac 
9 3 3 1 
— ee eee eee 
15.C le 
or ee 12 AC-: BEKO © OPAcw: se leac 
Observed 731 2 AE : 0 : 46 
Expect ate 744 : 186 : 0 : 62 
Ill. Band C. B segregates 3: 1, C1 
comparable to II. 
or 
: 1, so this case is exactly 
Ratio 50 LZ "BC 36) 3: bC. z=. 0 Be =  l-be 
Observed 4c 750 : 196 x. 10 : 46 (992 plants) 
Expect fe 744 : 186 Br a : 62 
The combination of 
apiculus ” (c) is not found. 
6. Variety Bailabakri x Pookhi. 
(A) The combination “ leaf-sheath, internode, stigma” sticks together 
(24 exceptions out of 4,687 had green internodes) and gives 3 
coloured : 1 colourless (total 7 families, 2:8: 1). 
‘coloured outer glumes ” (B) with “ colourless 
