TABLE 3

Results of crosses of females of the genotype X/X; net ho dp Sp b pr cn/+ + + + + + + carrying the indicated X chromosomes by +/Y; net ho dp b pr cn / net ho dp b pr cn malesa

Maternal genotype
Progeny typeb+/+cy w/+ cmei-P261mei-P261/+ dmei-P261/mei-P26fs1mei-P26fs1/+mei-P261/Dfemei-P261; bamΔ86/+f
Noncrossover9951512773819363218816996
Single crossover
1228299481581345011
23695981223863698294
3565470772114021
47152415262651
Double crossover
1,220729127
1,3314422
1,413214
2,37668225
2,4235714
3,4211
Triple crossover112
Quadruple crossover
Total progeny17122500106114864643891186103
Map distances
1 (net-dp)14.712.45.411.63.013.00.51.0
2 (dp-b)24.224.612.827.78.627.24.83.9
3 (b-pr)3.92.47.96.15.24.91.11.0
4 (pr-cn)0.60.83.11.66.00.92.71.0
Total43.440.329.247.022.846.09.16.8
Map relative to
control
1 (net-dp)10.8440.3670.7890.2040.8840.0340.068
2 (dp-b)11.0170.5291.1450.3551.1240.1980.161
3 (b-pr)10.6152.0261.5641.3331.2560.2820.462
4 (pr-cn)11.3335.1672.66710.0001.5004.5003.000
Total10.9290.6731.0830.5251.0600.2100.196
Exchange rank
frequencies
E00.2090.2260.4990.1430.5860.1670.8170.864
E10.7140.7420.4260.7790.3710.7510.1830.136
E20.0770.0320.0680.0730.0430.07800
E3000.0080.00500.00400
E400000000
  • a Female progeny were scored in the indicated crosses (see materials and methods) except for the +/+ control and y w mei-P261; bamΔ86 ry e/ + + + crosses, in which all progeny were scored. In the y w mei-P261; bamΔ86ry e/ + + + cross, eye color phenotype was not scored in male progeny, with the assumption that few b-pr or pr-cn recombinants were present. For this reason, the map distances for these intervals may have been underestimated in this cross.

  • b Region 1 is net-dp; region 2 is dp-b; region 3 is b-pr; region 4 is pr-cn.

  • c It should be noted that the control recombination levels differ from the standard Drosophila genetic map (Lindsley and Zimm 1992), although they are similar to previously published control values (Baker and Carpenter 1972).

  • d A possible semidominant effect on recombination was suggested by Sekelsky et al. (1999) using a comparison to standard map distances. However, comparison of recombination in mei-P261/+ females vs. wild-type controls indicates no such effect.

  • e Df(1)18.1.15 was used in this experiment.

  • f bamΔ86 is carried on chromosome 3.