310 Proceedings of Indiana Academy of Science. 
Table XVI. F. generation from straight black @ by gray curveda’. 
Number Straight gray |Straight black) Curved gray | Curved black 
1 80 39 20 0 
2 114 30 36 0 
e 219 104 67 Oia 
Matalin. 84. 415 173 123 0 
2. Curved 9 by black &. 
The reciprocal cross in which the curved g is mated to the black ¢ gave 
all wild type in the F, generation. These inbred gave results as given in 
table XVII. These results show very clearly that there is linkage between 
black and curved since the double recessive does not appear in F,. 
Table XVII. FF: generation from gray curved @ by straight black o. 
Number Straight gray Straight black) Curved gray | Curved black 
1 131 41 31 0 
2 139 45 31 0 
: 104 58 - 34 0 
Motel ee. ore 374 144 96 0 
3. Curved 9 by black purple curved &. 
Tables XVIII and NIX give additional data in which curved was crossed 
to the triple recessive black purple curved obtained from Morgan in the fall 
of 1918. The curved 92 by the black purple curved @ gave 200 gray red 
eyed curved sons and 218 gray red eyed daughters. The fact that all the F, 
had curved wings is conclusive proof that Morgan’s curyed stock and mine 
are identical. The independent change affecting the germ plasm had changed 
identical genes. Matings were made from the F, with the results recorded 
in table XVIII. 
