200 
GENETIC STUDIES ON THE SILKWORM 
Exp. ratio 3:3:1:1 
Summary of the above three families : 
LK " 356 : Lk 202 : IK 150 : lk 42 
which agrees roughly with the normal ratio 9:3:3:1. 
Multilunar Pattern (L). 
By "multilunar" I mean the type of marking which is composed of at 
least four pairs of large, yellowish spots of round shape occurring on the 
dorsal side of the larva. It is interesting that the lunar spots correspond in 
position and number to those of the knobs in the multilunar knobbed strain. 
a) L and Z. 
As to the hereditary behaviour there is, as already stated, a great 
resemblance between the multilunar and zebra, but these two characters are 
transmitted quite independently of each other. 
Heterozygous multilunar-zebra whites (PPQqZzLlyy ) mated inter se . 
A 748'i5 Multil. (L) Non-multil. ( 1 ) Totals 
Norm. zebr. 
PQZ 
69 
30 
99 
Norm. 
POz 
27 
7 
34 
PI. zebra. 
PqZ 
64 
'3 
77 
PI. 
Pqz 
5 
6 
1 1 
Totals 
165 
56 
221 
Of which 
ZL 133 
: Zl 43 
: zL 32 
: zl 13 
Heterozygous multilunar-zebra yellows (PPQ,Q,ZzLlYy ) mated inter se. 
A 75l'iS Multil. (L) Non-multil. (1) Totals 
Norm. zebr. 
yel. 
PQZY 
67 
3D 
97 
Norm. zebr. 
wh. 
PQZy 
23 
1 1 
34 
Norm. yel. 
PQzY 
27 
8 
35 
Norm. wh. 
PQzy 
6 
4 
10 
Totals 
123 
53 
176 
Of which 
ZL 90 : 
Zl 4' 
: zL 33 : 
zl 12 
A 754'i5 (P- J99) '38 : 38 = 42 : 13 
Summary of the above three families : 
1) The deficit of LK and excess of Lk are perhaps accidental. 
