MEIOSIS IN THE FEMALE 



61 



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

 evident that the bivalents resulting from syndesis condense continuously 



FIG. 25. 



F 



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

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



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

 are carrying egg-sacs contain in their oviducts oocytes with well-developed 

 germinal vesicles with diffuse chromosomes. Hacker suggests that in 



