though whether the nature and functioning of the "spindle" is the same 

 in all cases has yet to be determined. Tempting as it may be to parallel 

 "mitotic" stages in a blue-green alga with those in an onion root tip, 

 one should remember that we may be unjustifiably assuming homology 

 of configurations which are really only analogous. 



Figure 10-4. Photomicrograph Showing Typical Anaphase Configuration 

 During Mitosis in the Alga, Spirogyra. Note well-defined spindle apparatus 

 and distinct chromosomes. (Courtesy of General Biological Supply House, 

 Inc., Chicago, 111.) 



BIBLIOGRAPHY 



Bisset, K. A., 1951. "The Genetical Implications of Bacterial Cytology," 

 Cold Spring Harbor Symposia on Quant. Biol., 16, 381-412. 



DeLamater, E. D., 1951. "A New Cytological Basis for Bacterial Genetics," 

 Cold Spring Harbor Symposia on Quant. Biol., 16, 373-379. 



Delbruck, M. and Stent, G. S., 1957. "On the Mechanism of DNA Replica- 

 tion," in "The Chemical Basis of Heredity," B. Glass and W. D. McElroy 

 (Eds.), Johns Hopkins Univ. Press, Baltimore, Md., pp. 699-736. 



Glass, B., 1957. "A Summary of the Symposium on the Chemical Basis of 

 Heredity," in "The Chemical Basis of Heredity," B. Glass and W. D. 

 McElroy (Eds.), Johns Hopkins Univ. Press, Baltimore, Md., pp. 757-834. 



REPLICATION OF GENETIC MATERIAL IN MICROORGANISMS / 207 



