2Q2 



GENERAL BIOLOGY 



FIG. 175. Diagram of nuclear behavior in cell division (after 

 Wilson), a, resting stage between divisions; b, beginning of 

 division phenomena; c and d, formation of nuclear spindle 

 and fragmentation and splitting of chromosomes; e tot, later 

 stages: t, centrosomes; u, nucleolus; v, spireme; w, chromo- 

 somes; x, x, asters: y, chromosomes in equatorial plate; z, 

 chromosomes separating. 



