[Illustration: Fig. D.--_a_, normal wing; _b_ and _c_, fused wings. _c_ shows a typical fused wing. The most striking feature is the closure of the cell between the third and fourth longitudinal veins with the elimination of the cross-vein; the veins at the base of the wing differ from those in the normal shown in a. _b_ shows the normal position in which the fused wings are held. The fusion of the veins in _b_ is unusually complete.]
Males from the stock of (red) bar fused were mated to vermilion (not-bar, not-fused) females, and produced bar females and vermilion males. The bar F_1 daughters were back-crossed to vermilion fused males and produced the classes of offspring shown in table 34.
TABLE 34.--P_1 _vermilion_ [female] [female] × _bar fused_ [male] [male]. _B. C. F_1 bar_ [female] × _vermilion fused_ [male] [male].
+----------+-------------------+---------------------+------------------+ | | v | v B' f_u | v f_u | | | ----------------- | ----+-------------- | -----------+---- | | | B' f_u | | B' | |Reference.+----------+--------+----------+----------+-----------+------+ | | | | Vermilion| | | | | |Vermilion.| Bar | bar |Wild-type.| Vermilion | Bar. | | | | fused. | fused. | | fused. | | +----------+----------+--------+----------+----------+-----------+------+ |140 I | 137 | 130 | 35 | 40 | 5 | 8 ~ |141 I | 144 | 137 | 38 | 41 | 4 | 2 ~ |142 I | 153 | 120 | 43 | 58 | 6 | 7 | |143 I | 153 | 92 | 44 | 41 | 3 | 7 | |145 I | 69 | 62 | 29 | 19 | 1 | .. | |146 I | 96 | 103 | 30 | 34 | 7 | 3 | |156 I | 62 | 45 | 25 | 27 | 1 | 4 | |157 I | 93 | 57 | 11 | 31 | 2 | 2 | | +----------+--------+----------+----------+-----------+------+ | Total. | 907 | 746 | 255 | 291 | 29 | 33 | +----------+----------+--------+----------+----------+-----------+------+
+--------------------+--------+--------------------------------+ | v B' | | | | ----+--------+---- | | Cross-over values. | | f_u | | | +-----------+--------+ +-----------+--------+-----------+ | | | Total. | | | | | Vermilion | Fused. | | Vermilion | Bar | Vermilion | | bar. | | | bar. | fused. | fused. | +-----------+--------+--------+-----------+--------+-----------+ ~ .. | .. | 355 | 21 | 4 | 25 | ~ .. | .. | 366 | 22 | 2 | 23 | | 1 | .. | 388 | 26 | 4 | 29 | | 3 | 1 | 344 | 26 | 4 | 28 | | 1 | .. | 181 | 27 | 1 | 27 | | .. | .. | 273 | 23 | 4 | 26 | | .. | .. | 164 | 32 | 3 | 35 | | .. | 2 | 198 | 22 | 3 | 23 | +-----------+--------+--------+-----------+--------+-----------+ | 5 | 3 | 2,269 | 24 | 3 | 27 | +-----------+--------+--------+-----------+--------+-----------+