+------------+----------+-----------+-----------+-----------+--------+ | | v B' f_u | v | v B' | v f_u | | | | -------- | --+------ | -----+--- | -+---+--- | Total. | | | | B' f_u | f_u | B' | | +------------+----------+-----------+-----------+-----------+--------+ | | | | | | | | | 5,621 | 1,756 | 175 | 15 | 7,567 | | Percentage | 74.3 | 23.19 | 2.31 | 0.2 | | | | | | | | | +------------+----------+-----------+-----------+-----------+--------+ Some additional data bearing on the linkage of vermilion and fused were obtained. Males of (red) fused stock were bred to vermilion (not-fused) females, and gave wild-type females and vermilion males, which inbred gave the results shown in table 37. The percentage of cross-overs between vermilion and fused is here 27, which is in agreement with the 26 per cent of the preceding experiment. The converse experiment, namely, red (not-fused) females by vermilion fused males also gave, when the wild-type daughters were {57} back-crossed to vermilion fused males, a linkage value of 27 units. Two 10-day broods were reared from each female. The data given in table 38 show that the percentage of crossing-over does not change as the flies get older. The locus of fused on the basis of all of the data is at 59.5. TABLE 37.--P_1 vermilion [female] [female] x fused [male] [male]. F_1 wild-type [female] [female] x F_1 vermilion [male] [male]. KEY: A: Non-cross-over [male] [male]. B: Cross-over [male] [male]. C: Females. D: Vermilion. E: Fused. F: Vermilion fused. G: Wild-type. H: Total [male] [male]. I: Cross-over values. +------------+-----+-----------+----------+-----+----+ | | | A | B | | | | | +-----+-----+----+-----+ | | | Reference. | C | D | E | F | G | H | I | +------------+-----+-----+-----+----+-----+-----+----+ | 79 I | 299 | 93 | 96 | 37 | 36 | 262 | 28 | | 80 I | 245 | 93 | 60 | 28 | 27 | 208 | 26 | | 81 I | 263 | 101 | 63 | 22 | 40 | 226 | 27 | | +-----+-----+-----+----+-----+-----+----+ | Total. | 807 | 287 | 219 | 87 | 103 | 696 | 27 | +------------+-----+-----+-----+----+-----+-----+----+ TABLE 38.--P_1 wild [female] [female] x vermilion fused [male] [male]. F_1 wild-type [female] x F_1 wild-type [male] [male]. KEY: A: Wild-type [female] [female]. B: Non-Cross-over [male]. C: Cross-over [male]. D: Vermilion fused. E: Wild-type. F: Vermilion. G: Fused. H: Total [male] [male]. I: Cross-over values.