236 



GENETICS 



Fig. 59. Entry of Sptrm Fig. 60. Loss of.'SpenmTail 



Fig. 61. Division of 

 Centrosome 



KB. 62. Approach of $p,erm Hg, 63. Star ease of Sjperm, Fig. S^Formation of 

 Nucleus itPacleus Chromosomes 



Big. 66. Splitting of Chromosomes 



Fig, 66. Anaphase 



Fag. 67. Two-celled Stage 



FIGS. 59-67. Diagrams illustrating fertilization. After Boveri. 



