I4 o GENETIC STUDIES ON THE SILKWORM 
normal and striped gives F 3 normal which are lightly marked ; if dark normal 
are used as the recessive parents, F 2 normal are intensely marked : in other 
words, the marking types of normal parents reappears in F 2 with nearly equal 
intensity. So long as the genetic constitution of the striped is not explained, 
the above results might seem to suggest multiple allelomorphic relation of 
the striping, normal and plain factors (Sturtevant, 191 5). But this was not, 
as shown below, actually the case. 
Striped-quails (SpQ,) were crossed with pale-quails (spq), and the individu- 
als which are heterozygous for only Sft were obtained. The hybrids were 
mated inter se, as well as cross-bred with double recessive. 
Heterozygous striped-quails (Sspp&q) inbred. 
Striped-quai 
1 Pale-quail 
Totals 
A soi'is 
228 
55* 
283 
A rm'i p 
-TV ^\J~ 1 ^ 
-94 
105 k 
399 
A s 1 1 ' 1 5 
246 
62 * 
308 
A c t °' r c 
I 6 — 
65 * 
227 
Totals 
930 
287 
1217 
Expect. 
9'3 
304 
1217 
The hybri 
d (Ssppaq) ?? 
x pale-quail (ssppqq) ££. 
Striped-quai 
[ Pale-quail 
Totals 
A 5'5''5 
209 
220 * 
429 
A 5 1 6' 1 5 
225 
207 * 
432 
Totals 
434 
427 
861 
Expect. 
430-5 
430-5 
861.0 
Pale-quail 
: (ssppqq) ? ? x 
the hybrid ( SsppQq) J % . 
Striped-quai^ 
I Pale-quail 
Totals 
A 513'! 5 
125 
117* 
242 
A 5i4'i 5 
47 
40 * 
87 
A 5*7'' S 
141 
155* 
296 
Totals 
313 
312 
625 
Expect. 
312.5 
312.5 
625.0 
