II 



MEIOSIS IN THE FEMALE 



6i 



germinal vesicles with diffuse chromosomes are to be found, and it is 

 evident that the bivalents resulting from syjidesis condense continuously 





'^^ 



^:^.f^ 







B 



D 





O 



C# «^ o 







lf\«a 



^ 



ib/^^^vi^r-CO 



vV 



^ 



Fig. 25. 



The chromosomes during the oogenesis of Diaptomus castor from tlie pachytene stage (A), through the 

 germinal vesicle stage (B-E) to the condensation of the definitive bivalents (V). (Matschek, A.Z., 1910.) 



into the definitive bivalents of metaphase I. Animals, however, which 

 are carrying egg-sacs contain in their oviducts oocytes witli well-devcloj)ed 

 germinal- vesicles with diffuse chromosomes. Hacker suggests that in 



