182 



PHYSICAL BASIS OF HEEEDITY 



d 



f 



Fig. 81. — First spermatocyte division a-c, and the second spermatocyte division d-f in 



the hornet. (After Meves.) 



in that the second division produces two functional 

 sperms, both female producing. 



Since the male comes from an unfertilized egg^ the 



