Table 1.
Phenotypes of sna expression in different genetic background
| Maternal genotypes | Normal, % | Type I, % | Type II, % | n |
|---|---|---|---|---|
| dl/+ | 92.4 | 7.6 | 0.0 | 471 |
| dl/+; Df(3)TAFII110/+ | 42.4 | 43.5 | 14.1 | 177 |
| dl/+; Df(3)TAFII60/+ | 59.0 | 37.8 | 3.2 | 188 |
| dl/Df(2)TBP | 18.6 | 29.4 | 52.0 | 19 |
| dl/M(2)53C | 83.2 | 16.8 | 0.0 | 125 |
“Normal” is defined as sna expression patterns indistinguishable from those of embryos derived from wild-type females. “Type I” embryos displayed a variable narrowing, especially near the cephalic furrow region. “Type II” embryos showed a more severe disruption of the snail staining pattern. snail expression domains were usually 10–15 cells wide around 50% egg length and 5 cells or less around the cephalic region. Embryos from crosses indicated in Fig. 1 (A–D) abd embryos derived from the mating of male M(2)53C/+ X female M(2)53C/dl1 were scored.