Figure 7-4. Photomicrograph Showing Relational Coiling in the B, D, 

 and E Chromosomes of a Giant Microspore of Trillium grandiflorum with 

 Nine Chromosomes. (From Sparrow, A. H., Huskins, C. L., and Wilson, 

 G. B., 1941. "Studies on the Chromosome Spiralization Cycle in Trillium,'''' 

 Can. J. Res., C, 19, Fig. 28, Plate IV. Courtesy of Dr. A. H. Sparrow, 

 Brookhaven National Laboratory.) 



170 / CHAPTER 7 



