396 



CHAPTER 43 



A ciSTRON <HHiroo 



FiGURE 43-5. Genetic map of the rll region of phage T4. The 

 breaks in the map indicate segments as defined by the ends of 

 deletions. The order of the segments has been determined as 

 shown. The order of mutants within any one segment has not 

 been determined, but all give recombination with each other. 

 The hollow circles and other filled-in symbols represent different 

 types of phenotypic effects. {Courtesy ofS. Benzer and S. P. 

 Champe, Proc. Nat. Acad. Sci., hb 



U.S., 47:1030-1031, 1961). ^ 



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