THE REDUCTION OF THE CHROMOSOMES 





J^P 



Fig. 87. — Nuclei from microsporocytes of Viria faba, showing parasynapsis. 

 Synigesis beginning in No. 6. X 1900. 



Fig. 88. — Heterotypic prophases In spermatocyte of Tomopteris 



A, pairing of leptotene threads beginning. />'. pairing complete in some threads and 

 only beginning in others. C, conjugation complete; pachynema stage. D, resplitting 

 of pachytene threads (separation of conjugated chromosomes l l. mul K 



Schreiner, 1905.) 



