Table 2 Tests of zygotic and maternal suppression hypotheses
ObservedFemalesMalesP valuea
C. nigoni × C. briggsae cbr-him-8/+b,c3531
Expected
Zygotic suppressiond331.322.72.567 × 10−6
Maternal suppressione353.30.70.685
  • a P values from chi squared tests using the expected male frequencies for the zygotic and maternal suppression hypotheses described above.

  • b C. nigoni EG5268 ♂♂ × C. briggsae cbr-him-8(v188)/+ I; stIs20120 [p-myo2::GFP] X, or C. nigoni EG5268 ♂♂ × C. briggsae cbr-him-8(v188)/+ I; stIs20120 [p-myo2::GFP]/+ X.

  • c This cross is diagrammed in Figure 2E.

  • d An expected male frequency of 6.4% was based on the expected 50% transmission rate of cbr-him-8(v188) from maternal heterozygotes and on the 12.8% frequency of viable adult XCbr males from cbr-him-8(v188) homozygous mothers.

  • e An expected male frequency of 0.19% was based on the frequency of viable males obtained from crosses of C. nigoni males to wild-type C. briggsae hermaphrodites (Kozlowska et al. 2011).