302 Proceedings of Indiana Academy of Science. 
in Indiana. Twelve curved of both sexes appeared simultaneously in the 
culture bottle. The mutant has been kept in pure culture since that time. 
A number of crosses with mutants known to belong to different chromosome 
groups are here recorded. 
I. Behavior of the curved winged mutant with normal wild stock. 
Chromosome I. 
1. Curved @by wild. 
A curved wing female bred to the normal long wing male produced 18 
sons and 13 daughters,—all with wings typical of wild stock. These when 
inbred gave in the F, generation 107 curved and 348 wild type flies. Table 
I. Both sexes are affected. This result demonstrates curved to be a reces- 
sive, non sex-linked mutant giving a Mendelian ratio of approximately 3 to 1. 
It is evident that the gene for curved is not carried by chromosome I, since 
it does not show sex-linkage. 
Table I. F, generation from curved 2 by wild ¢. 
Number | Normal oo | Normal @ 2 | Curved o'c' | Curved 2? 9 
| 
| 
| 
| } 
| 
| 
1 48 | 46 | 8 11 
la 52 32 21 | 18 
| 46 55 | 13 | 13 
Lee) 24 45 13 | 10 
Total . 170 | 178 | 55 52 
Il. Behavior of curved with bent. Chromosome IV. 
1. Curved 9 by bent 7. 
Bent is a wing mutant first described by Muller who demonstrated that 
its gene belongs to Group IV. The curved female by bent male gave all 
normal flies of the wild type in the F, generation. These inbred produced in 
F, the different classes given in table II. 
Table II. F, generation from curved 2 by bent. 
Wild type | Wild type | Curved Curved Bent Bent 
resiop 8, cls sal one repute as: 
66 90 37 29 33 31 
