For the time being we are able to present only incomplete results upon this cross. In the first experiment cherry females were crossed to club vermilion males and the wild-type daughters were back-crossed to cherry club vermilion, which triple recessive had been secured for this purpose. Table 53 gives the results.
Table 53.—P1 cherry ♀ ♀ × club vermilion ♂ ♂. B. C. F1 wild-type ♀ × cherry club vermilion ♂ ♂.
| Refer- ence. |
|
|
|
| Total. | Cross-over values. | ||||||
| Cherry. | Club ver- milion. | Cherry club ver- milion. | Wild- type. | Cherry ver- milion. | Club. | Cherry club. | Ver- milion. | Cherry club. | Club ver- milion. | Cherry ver- milion. | ||
| 163 | 68 | 68 | 4 | 10 | 21 | 13 | 1 | 0 | 185 | 8 | 19 | 26 |
| 164 | 99 | 67 | 13 | 21 | 21 | 12 | 1 | 0 | 234 | 15 | 15 | 29 |
| 165 | 23 | 37 | 9 | 7 | 15 | 2 | 0 | 2 | 95 | 19 | 25 | 35 |
| 166 | 107 | 86 | 14 | 28 | 31 | 43 | 3 | 3 | 315 | 15 | 25 | 37 |
| 167 | 42 | 49 | 7 | 11 | 12 | 11 | 2 | 2 | 136 | 16 | 20 | 30 |
| 168 | 40 | 30 | 6 | 15 | 16 | 8 | 0 | 0 | 115 | 18 | 21 | 39 |
| Total. | 379 | 337 | 53 | 92 | 116 | 89 | 7 | 7 | 1,080 | 15 | 20 | 32 |
A complementary experiment was made by crossing cherry club vermilion females to wild males and inbreeding the F1 in pairs. Table 54 gives the results of this cross.
Table 54.—P1 cherry club vermilion ♂ ♂. ♀ ♀ × wild ♂ ♂. F1 wild-type ♀ × F1 cherry club vermilion ♂ ♂.
| Refer- ence. |
|
|
|
| Total. | Cross-over values. | ||||||
| Cherry club ver- milion. | Wild- type. | Cherry. | Club ver- milion. | Cherry club. | Ver- milion. | Cherry ver- milion. | Club. | Cherry club. | Club ver- milion. | Cherry ver- milion. | ||
| 188 | 60 | 76 | 12 | 8 | 12 | 29 | 2 | 1 | 200 | 11 | 22 | 30 |
| 189 | 228 | 314 | 48 | 44 | 50 | 60 | 1 | 8 | 753 | 13 | 16 | 27 |
| 197 | 68 | 81 | 23 | 13 | 9 | 22 | 2 | 0 | 218 | 17 | 15 | 31 |
| Total. | 356 | 471 | 83 | 65 | 71 | 111 | 5 | 9 | 1,171 | 14 | 17 | 28 |
The combined data of tables 53 and 54 give 14.2 as the value for cherry club. All the data thus far presented upon club vermilion (886 cross-overs in a total of 4,681), give 19.2 as the value for club vermilion. The locus of club on the basis of the total data available is at 14.6.
GREEN.
In May 1913 there appeared in a culture of flies with gray body-color a few males with a greenish-black tinge to the body and legs. The trident pattern on the thorax, which is almost invisible in many wild flies, was here quite marked. A green male was mated to wild females and gave in F2 a close approach to a 2:1:1 ratio. The green reappeared only in the F2 males, but the separation of green from gray was not as easy or complete as desirable. From subsequent generations a pure stock of green was made. A green female by wild male gave 138 wild-type females and 127 males which were greenish. This green color varies somewhat in depth, so that some of these F1 males could not have been separated with certainty from a mixed culture of green and gray males.