G. P. HECTOR 167 
Here the combination of “‘green apiculus’’ (d) with “ coloured leaf-sheath, 
internode, stigma ” (A) is not found. 
A is again due toa single factor, D toa second additional factor 
interacting with the factor for A, both or either producing colour. Thus 
12 A 4a 
re eee —|_ 
AD Ad aD ad 
9 ; 33 3 1 
<r A 
15") ld 
or pe 122 ADs: 3 aD- :0 Ad: 1 ad 
Observed sxe «=, 485 00 sO 3: 297 (7 families of 4,687 
plants) 
Expect ae SDL DAG. : 878579 72-0 : 292-93 - 
IV. Band C. B segregates 9: 7,C3:1. If independent segregation 
takes place, the expected rativ is— 
2 BC : 2ibO* : 9eBer 7 be 
Observed rene 992 : 1,579 PG : 501 (7families of 4,687 
plants) 
Expect pen Le Oiioore os tbo oe as, sOo9eT : 512°64 
Here all expected combinations are found in expected ratios. 
V. Band D. B segregates 9: 7, D 15: 1, so if independent segregation 
takes place, the expected ratio is— 
135 BD: 105 bD : 9 Bd : 7 bd 
Observed -- 2,607 2 LETS : 0 : 297 (7 families of 4,687 
plants) 
¢ 
The combination “coloured pulvinus and auricles’ (B) with “green 
apiculus ” (d) does not occur. : 
If B is due to two interacting factors, both necessary for the production 
of colour, and D due to the same two, but either alone capable of producing 
colour, we get the required result. Thus— 
9B : 7b 
ese Meare 
BD : Bd : bD : bd 
9 : rane: 3 gal 
SS 
15 D oy pas ld 
9 BD GubDe: se Oba:  Ltbd 
Observed sq PACS palleutck: 0 : 297 
Expect Bol) Pape yi Gary Gis Be A ; 292-93 
