i 
AS CAUSE OF THE APPARENT CONSTANCY OF THE MUTANT „SPREAD. 331 
VII. New normal X Old Spread 
spr Vit opr Vit 

Theoretically : =S A MA 
nn spr vit x spr vit 
EON PDE Ve sr u 
Spr Vit’) — spr vit | Spr Vit’ | spr vit 
Bin i 
Phenotype: Spread normal Spread | dies 
| 
(new type) | (new type) (old type) 









Spread Normal 
09 | ad | 99 | a 
x K 135 TER 5008 244 10.39 
x K 136 45 63 22 19 
x K 137 33 SOS ue 20 
K 138 1320 N see LO 
K 181 18 | 11 8 6 
XK 184 60 40 2200 028 
K 198 35 LIE A022 00822 
K 199 30 LERNTE 
305 | 282 | 139 162 


Found inall. .. 587 | 301 


Theoretically. . . 592 | 296 

The preceding crossing results may be summarised thus: 
Old Spread X Old Spread = Old Spread 
Old Spread x Old normal = 1 New Spread: 1 New normal 
Old normal X Old normal = Old normal 
Old Spread x New Spread = 1 Old Spread: 1 New Spread: 
1 New normal 
-Old Spread x New normal = i 5 1 New Spread: 
| 1 New normal 
Old normal x New normal = 1 Old normal: 1 New normal 
Old normal X New Spread — 1 New Spread: 1 Old normal 

