42 



GENETICS 



This is a slow, gradual process, that can be seen under 

 the microscope (see figure 15). 



3. The vesicles become so large that their boundaries 



/f/ii!\^ 



<Ml^. 



Figure 15. Transformation of the condensed chromosomes (a) by 

 absorption of fluid into vesicles which slowly enlarge (b, c, d, e, f), 

 finally constituting the nucleus. The figures show the process in the 

 cells of the egg of a fish, Fundulus. After Richards. 



touch, and are pressed together, the boundaries becoming 



very indistinct or completely disappearing (figure 15, e, f). 



4. The entire set of m (or 2«-i) vesicles derived from 



