E F 



Fig. 24. Fertilization of the Egg of the Nematode 

 Worm Ascaris megalocephala; JIV, egg nucleus; rfN, sperm 

 nucleus; Arch, archiplasm; C, centrosome; A, B, approach of 

 germ nuclei; C, D, formation of two chromosomes in each 

 germ nucleus; E, F, stages in the division of the chromosomes 

 which are split in E and are separating in F; only three 

 chromosome pairs are shown in F. (From Wilson after 

 Boveri.) 



