206 CELL HEREDITY 



cul picture c)t breakage and rejoining of ehronuitids at the tour-strand 

 stage; and (2) that copy-choice is the common basis of all genetic recom- 

 bination (with sister-strand exchange a necessary cofeature). The great 

 discrepancy between these two points of view underscores how much is 

 yet to be learned about this process. 



BIBLIOGRAPHY 



Case, M. E., and N. H. Giles, 1958. Recombination mechanisms at the pan-2 



locus in Neurospora crassa. C. S. H. Symp. Quant. Biol., 23:119-135. 

 Chargaff, E., and J. N. Davidson, 1955. The Nucleic Acids, Vol. II. New 



York, Academic Press. (Articles by Swift and by Vendreley. ) 

 Gall, J. G., 1958. Ghromosomal differentiation. In: McElroy, W. D. and B. 



Glass, (eds.). The Chemical Basis of Development, Baltimore, The Johns 



Hopkins Press, pp. 103-135. 

 Hayes, W., and R. C. Clowes (eds.), 1960. Microbial Genetics. Society for 



General Microbiology, 10th Symposium. Cambridge, The University Press, 



(Articles by Kellenberger and by Pritchard. ) 300 pp. 

 Komberg, A., 1960. Biologic synthesis of deoxyribonucleic acid. Science, 



131:1503-1508. 

 Meselson, M., and F. Stahl, 1958. The replication of DNA in Escherichia coli. 



Proc. Natl. Acad. Set. Wash., 44:671-682. 

 Mitchell, M. B., 1955. Aberrant recombination of pyridoxine mutants of 



Neurospora. Proc. Natl. Acad. Sci. Wash., 41:215-220. 

 Pontecorvo, G., 1958. Trends in Genetic Analysis. New York, Columbia 



University Press, 145 pp. 

 Ris, H., 1957. Chromosome structure. In: McElroy, W. D., and B. Glass 



(eds.). The Chemical Basis of Heredity. Baltimore, The Johns Hopkins 



Press, pp. 23-69. 

 Taylor, J. H., 1957. The time and mode of duplication of chromosomes. Amer. 



Nat., 91:209-221. 

 Taylor, J. H., P. S. Woods, and W. L. Hughes, 1957. The organization and 



duplication of chromosomes as revealed by autoradiographic studies using 



tritium — labeled thymidine. Proc. Natl. Acad. Sci. Wash., 43:122-128. 

 Taylor, J. H., 1959. The organization and duplication of genetic material. 



X Ind. Congr. Genet., 1:63-78. 

 Taylor, J. H., 1960. Asynchronous duplication of chromosomes in cultured cells 



of Chinese hamster. /. Biophys. Biochem. Cytol., 7:455-464. 



