104 SEX INHERITANCE 
Xx may remain in the egg and Xx’ pass out; or, 
in other eggs, Xx’ may remain in the egg and Xx 
may pass out. There will be, in consequence, two 
T° GENERATION 
Xx Xx Xx Xx’ 
STEM MOTHER ~ FEMALE-PRODUCING LINE (STEM MOTHER - MALE-PRODUCING LINE 
| Xx STEM MOTHERS EGGS x | | 
2"? GENERATION 
1 
Xx Xx Kx Kx 
MIGRANT- FEMALE PRODUCER MIGRANT.- MALE PRODUCER 
XX xx! 
Hse. Xx SA&N. 
| | | | POLAR SPINDLES | | | | 
X Xx: 
FEMALE ECG MALE ECCS 
3”? GENERATION 
Xx Xx Xx Xx 
FEMALE MALE. TYPE 1 MALE.TYPE 
FEMALE PRODUCING 
oN, 
Xx POLAR SPINDLE 
| 2 DEGENERATE, 
x PERM 
SEXUAL EGG 
Fig. 35.—Diagram to illustrate the chromosomal cycle of Phylloxera 
caryecaulis. 
