MECHANISM IN SEaREaATION 



45 



die, each half of each chromosome becoming attached by 

 a spindle fibre to one pole (Fig. 18, d). The halves move 



Fig. 18. Last spermatogonia! division of Tomopteris, a-h; stages before and during 

 synapsis, i-l. (After Schreiner.) 



apart towards their respective poles (Fig. 18, e) and as 

 they become separated into two groups the cell protoplasm 



