LOSS OF EYE-PIGMENT [IN GAMMARUS. 307 
Cross C. F. 2. GENERATION. REDS. 
Turning now to the Red F,, according to Hypothesis I these are of 
two kinds, one with only one dose of red and no factor for albino (C C R), 
and two with only one dose of red and with the factor for albino (Cc R). 
There are three possible ways in which these reds could be mated 
together and these matings would give the following :— 
(1) CORSeOGR 
Male Gametes :— ‘C Rand C 
Female _,, C Rand C 
Zygotes CRCER 
CRC 
CRC 
CC 
that is one CC RR, two CCR, one CC 
»» >, 3 reds and | albino. 
(2) CeRxCcR 
Male Gametes Cr Oy Chine 
Female _,, CR, Cave KR, sc 
Zygotcs CRs ee eR lee 
CR CR CR CR 
CR C cR c 
C C C C 
CR C ek Cc 
ec R e R eR en 
CR C eR c 
c c € c 
That is 9 reds and 7 allbivos: 
(3) COR Cie R 
Male Gametes CR and C 
Female __,, a2 JCA (Cx cot." \e 
Zr eows Gree cR |e | 
Ca OR Chak aOR. | 
a | 
GR C cR Cc | 
C C (0; ¢ 
That is 6 reds and 2 albinos. 
It will be seen that in each case, that is to say, in whatever way the 
