KUK l lU'.R DA I A ON rill'. KKl )rri,ICA T 1( )N IN SILKWORMS. j, 
3. coMrr.i':x riii<:NOMi<:NA Ria.ATiNG titi-: 
STRIPEDNESS. 
Sonic iri"ci;ul;ii"itics observed in the heredity of tlic .striped character 
arc described in tlic following- lines. 
a) Occurrence of a Rare Zygotic Series 2 AB : i aB : i ab. 
In a partial reduplication all possible F_, zygotic combinations (i. e. 
four) arc produced, while in a complete repulsion three, and in a complete 
coupling only two phenotypes can occur. Whenever there arc onl)- three 
phcnotypes present the zygotic .series should be, on an ordinary occasion, 
2 AB : I Ab : I aB, the last term (ab) being absent. 
In my experiments with the silkworm, however, I have met with two 
families giving an evidence for possibility of 2 AB : i aB : i ab zygotic 
series when inbred where no Ab individual occurred. An account of these 
families is given here. 
The striped yellows of the family H. i'i2 (Table III), the generation 
preceding that under consideration, would, as may be inferred from their 
pedigree, have consisted of four different forms with regards the zygotic 
constitution, namely SSYY, SSYy, SsYY and SsYy, The offspring of two 
matings amongst nine matings of these striped yellows showed a peculiar 
feature as given below 
Striped yellow 
Normal vcllow 
Normal white 
(SY) 
(sY) 
(sy) 
H. I-l'l2 
194 
80 
lOD 
H. i-4'i2 
192 
91 
81 
Total 
386 
171 
181 
Calculated on 2 : 
: r : I 369.0 
184.5 
184.5 
The Complete pedigree is put forth in the following table. 
I. (/. p. 2. 
