52 



n (total) 



where n indicates the number of the specified viral types, p{h) is the propor- 

 tion of the yield containing the h allele, and 1 — p(/f), p(r), and 1 — p(r) are re- 

 spectively the proportions containing the //+, r, and r+ alleles. The fraction 

 p(^) is equal to 1 — p(r) if the numbers of the two recombinant types are the 

 same, or approximately equal if these numbers are small. A fair idea of the 

 complete distribution of alleles is therefore given by the distribution of p(/f) 

 alone. Two examples of this distribution, showing the proportions of the h 

 allele in diflferent single bursts for the crosses hXrl and hXr7, are given in 

 fig. 6. 



01 lo- 



co 



O 



6 



d 



18 27 36 45 54 63 72 81 90 93 100 



per cen-b K virus 



10 



M-. 

 O 



L, 



s 



27 3S 45 54 63 72 81 90 



per cent K virus 



Figure 6. — Distribution of proportions of It virus in yields from single bacteria. 



100 



159 



