104 
Y. TANAKA. 
inheritance were observed. These are tabulated and analysed below in the 
light of the presence and absence hypothesis. As was the case in the forego- 
ing discussion I shall mention here only those factors in which either or 
both of the parents are heterozygous, or only those factors by which the two 
parents differ from eacli other. 
Table IV. 
Series 1. 
Lot 
Year 
No. 
Apparent Genetic 
Gametes 
character jCanstitutionJ 
Zygotes 
Apparent character 
Ratio 
Actual I Expecta- 
figures tion 
1895 
O 
Zebra yellow 
(Papillom 
noirs) t 
ZziiYy 
ZiY 
Ziy 1 
ziY 
ziy 
F, 
1 ZiYziY 
1 ZiyziY 
2 zebra yellow 
116 
114.7 
1 ZiYzIY 
1 ZiyzLY 
2 zebra white 
108 
114.7 
1 ziYziY 
1 ziYziv 
2 plain yellow 
124 
114.7 
Plain white 
(Blanc des 
Alpes) £ 
zzliYY 
zIY 
ziY 
1 ziYziY 
1 ziyzIY 
2 plain white 
111 
114.7 
Total 
459 
458.8 
1896 
AR 
Fi zebra 
yellow 
; ZiyziY 
ziY 
ZiY 
Ziy 
ziy 
F, 
1 ZiYZiY 
2 ZiYziY 
2 ZiYZiy 
4 ZiYziy 
9 zebra yellow 
236 
247.0 
1 ZiyZiy 
2 Ziyziy 
3 zebra white 
80 
82.3 
1 ziYziY 
2 ziYziy 
3 plain yellow 
89 
82.3 
1 ziyziy 
1 plain white 
34 
27.4 
Total 
439 
439.0 
