104 



SEX INHERITANCE 



other hand, the difference between the eggs contained 

 in the male-producing and in the female-producing 

 migrants, and between the behavior of the chro- 



xxxx 



STEM MOTHER 



1 '^GENERATION 



FEMALE 



MALE 



POLAR 

 SPINDLE 



FEMALE 



PRODUCING 



SPERM 



DEGEMERATE 

 5FERM 



Fig. 36. — Diagram to illustrate the chromosomal cycle of Phylloxera 



fallax. 



