SEGREGATION OF HOMOLOGOUS CHROMOSOMES 



475 



first spermatocyte without relation to the accessory, or to each 

 other when two are present. 



6. The first spermatocyte tetrads show three types of hetero- 

 morphism: 1) one homologue telomitic, the other atelomitic, 



Text-fig. 2 Curves showing the number of morphologically different classes 

 of spermatozoa. The abscissae represent number of classes, the ordinates 

 number of individuals. The large broken line is a composite of 'A : and 'B.' 



giving J-shaped tetrads. 2) both homologues atelomitic, one 

 with nearly median, the other with subterminal fiber attachment. 

 3) both homologues telomitic, one smooth, the other constricted; 

 or, one telomitic constricted, the other atelomitic. 



