Table 1. F1 progeny resulting from paternally inherited linear and circular (ring) sex chromosomes.
| Female parent | Male parent | F1 males | F1 females | % ring-bearing F1 progeny or % F1 malesa |
|---|---|---|---|---|
| Canton-S | Canton-S | 522 | 546 | 48.9 |
| Oregon-Rb | Oregon-R | 258 | 260 | 49.8 |
| ZH42b | ZH42 | 242 | 249 | 49.3 |
| B52b | B52 | 293 | 278 | 51.3 |
| w1118b | w1118 | 250 | 269 | 48.2 |
| y vb | y v | 262 | 259 | 50.3 |
| Canton-S | Bs Y y+ | 67 | 75 | 47.2 |
| Oregon-R | Bs Y y+ | 178 | 152 | 53.9 |
| ZH42 | Bs Y y+ | 169 | 176 | 49.0 |
| B52 | Bs Y y+ | 129 | 163 | 44.2 |
| y v | Bs Y y+ | 147 | 150 | 49.5 |
| Canton-S | YcF#2 | 78 | 336 | 16.2*** |
| Oregon-R | YcF#2 | 16 | 405 | 3.8*** |
| ZH42 | YcF#2 | 7 | 391 | 1.8*** |
| B52 | YcF#2 | 21 | 513 | 3.9*** |
| w1118 | YcF#2 | 17 | 731 | 2.3*** |
| y v | YcF#2 | 19 | 389 | 4.7*** |
| PN10A | YcF#2 | 113 | 167 | 40.4* |
| Canton-S | YcF#2 (Canton-S) | 132 | 296 | 30.8*** |
| Canton-S | R(1)2 | 179 | 176 | 49.6 |
| Oregon-R | R(1)2 | 272 | 265 | 49.3 |
| ZH42 | R(1)2 | 166 | 182 | 52.3 |
| B52 | R(1)2 | 202 | 242 | 54.5 |
| y v | R(1)2 | 234 | 217 | 48.1 |
| Canton-S | R(1;Y)15 | 211 | 134 | 38.8*** |
| Oregon-R | R(1;Y)15 | 184 | 143 | 43.7 |
| ZH42 | R(1;Y)15 | 337 | 221 | 39.6*** |
| B52 | R(1;Y)15 | 258 | 206 | 44.4 |
| w1118 | R(1;Y)15 | 435 | 301 | 40.9*** |
| y v | R(1;Y)15 | 243 | 181 | 42.7* |
F1 progeny inheriting the ring chromosome are indicated in boldface type. The progeny shown were produced from at least two independent crosses; in all cases, each set of progeny for a given cross was statistically confirmed to show a similar pattern and then pooled together. All crosses were conducted at 25°, except as indicated. F1 progeny were tested for deviation from a 1:1 ratio by a χ2 test. Bs Y y+ is a linear Y chromosome carrying translocated X heterochromatin on each of its ends (Oster 1964); YcF#2 is a strongly lethal ring X-Y chromosome derived from Bs Y y+ (Stone 1982); R(1)2 is a ring X-Y chromosome that is largely nonlethal (Stone 1982); R(1;Y)15 is a ring X-Y chromosome that is moderately lethal (Golic and Golic 2011). The YcF#2 (Canton-S) line was produced by four generations of backcrossing males to Canton-S females. PN10A is a D. melanogaster wild-type line of unknown origin; Canton-S and Oregon-R are standard wild-type lines; ZH42 and B52 are inbred isofemale lines collected in Zimbabwe and Beijing, respectively. w1118 and y v are marker strains. *P < 0.01; **P < 0.001; ***P < 0.0001.
Percentage of males are reported in crosses without ring chromosomes.
Cross was performed at room temperature.