CHROMOSOME COMPLEX OF SPERMATOCYTES. 3! I 



Why it should always be the same tetrad that is selected for this 

 association is not clear, and will perhaps become apparent only 

 when we learn the meaning that attaches to the intimate associ- 

 ation amone the maturation chromosomes. 



a 



FKJ. 6. Telophase of first spermatocyte of Hesperotettix. At the upper pole is the 

 multiple chromosome in which the accessory chromosome remains homogeneous while 

 the other element of the tetrad has again become granular. Homologous chromatids 

 are well separated. Fig. 6a shows a similar chromosome with the accessory chro- 

 matids less divergent. 



The close connection thus established by the accessory chro- 

 mosome persists through the later periods of the maturation 

 process. In the telophase the pair of chromosomes, consisting 



