z>* 



Protenor ^ 



D 



Fig. 65. — Maturation in Pro^enor. Male above. A. Spermatogonium. 

 B. Synapsis. C First maturation division. D, D'. Second mat- 

 uration division. E, E'. Two sorts of spermatozoa. 



Female below. A. Oogonium. B. Synapsis. C. First matura- 

 tion division. D. Second maturation division. E. Egg nucleus 

 and two polar bodies all alike in chromosome content. First polar 

 body is dividing. (From Morgan's Heredity and Sex, published by 

 the Columbia University Press.) (258) 



