232 



CHAP II R 17 



figure 17-7. Ralph E. Cleland points to zig-zag chromosomal arrangement 

 at the start of anaphase I of an Oenothera having a circle of 14 chromosomes 

 at metaphase I. {Photograph, 1959, courtesy of The Calvin Company.) 



figure 17-8. 

 thera. 



Manner of chromosome segregation during meiosis of Oeno- 



