No. 644] MUTANT CHARACTERS IN DROSOPHILA 239 



ing the normal allelomorph of the gene farthest to the 

 left. E.g., in Table II, experiment 3, under crossovers 

 in region 1 there are 48 normal bristle rough eye flies, 

 and 55 stubby bristle normal eye flies. 



The plus sign ( + ) indicates wild-type or normal. 



TABLE II 

 Two-point Ceosses 



TABLE III 



