THE CARRIERS OF THE HERITAGE 25 



fi^.16. Approach of 5per 

 Nucleus 



Fig.15. Entry of Sperm FI&16. Loss of SpermTdll R$17. Division of Centrosome 



ffg.ia Increase of Sperm F/(J.ao. Formation of 

 Nucleus Chromosomes 



F7&2.1. Splitting of Chromosomes 



. Anaphase 



Ff^.SS.Two-celled Stap,e 



FIGS. 15-23. Diagrams illustrating fertilization. After Boveri. 



