POLYPLOID SERIES 



155 



somes split lengthwise, and the daughter chromosomes 

 move to the poles, not, however, with complete regu- 

 larity. When the distribution is equal there will be 21 

 chromosomes at each pole. 



EMMER BY VULGARE 



m 3r 



*^4 



. s 



* 



* 





•7 s 



# 



Fig. 91. 



Eeduction division of the hybrid between Emmer and Vulgare 



wheat. (After Sax.) 



In passing it should be recorded that according to 

 Sax's results in a similar cross, the 7 single chromo- 

 somes do not divide at this time, but are distributed un- 

 equally to the poles, the more common distribution being 

 3 and 4 (Fig. 91). 



At the second division, according to Kihara, 14 chro- 

 mosomes that are split lengthwise appear and 7 chromo- 

 somes that are not split. The former divide, 14 going to 



