TABLE 3

Results of permutation testing procedure used to evaluate the significance of marker/bristle trait associations

Response variableaSet of predictorsbPermutation test round 1Permutation test round 2
CharacterMarkerP <CharacterMarkerP <
PC115 markersAB*sexIn R0.010SBMC-220.029
Inserts c,dSB0.023
W15 markerse
InsertscSB0.016
B15 markersfAB*sexIn R0.003AB*sexMC-210.044
InsertscAB0.025
  • a Variable tested for significance using the permutation testing procedure. PC1, principal component one; W, whole X chromosome substitution lines; B, introgression lines obtained by backcrossing. No markers were significant for principal component two.

  • b Set of predictors used in the permutation testing model. 15 markers, the set of all polymorphic markers plus a dummy variable corresponding to the presence or absence of large inserts (see appendix); Inserts, a dummy variable corresponding to the presence or absence of large inserts (excluding In R).

  • c All insert main effect tests are one-tailed.

  • d AB is P < 0.074.

  • e MC-22 for SB is P < 0.058; In R for AB*sex is P < 0.072.

  • f E-25.7 for SB is P < 0.073 in permutation test round 3; MC-22 for SB gave no indication of significance.