LINKAGE VARIATION IN DROSOPHILA 



13 



The summary for the data on the sex chromosome is given in 

 table 18, similar to table 13 for the second chromosome. The 

 total of females tested shows 17 cases of decrease and exactly 

 the same nmnber of increase, so that we may safely conclude 

 that there is no change here from first to second broods. The 



TABLE 15 

 Pi bar 9 9 X vermilion-fused d'd'. B. C. Fi bar 9 X vermilion-fused cf cf 



