174 



SUBCELLULAR PARTICLES 



Fig. 3 



Fig. 4 



^J 



■-.* 



"». 



is taken, each dauglilcr pair oi chromosomes has the ec]ui\alent of a completely 

 labeled chromosome and a completely unlabeled one. 



These observations support the hypothesis that DNA replicates by a template 

 mechanism such as that suggested by Watson and Crick (21). Additional sup- 

 port for the hypothesis has been obtained by an analysis of the frequency and 



