TABLE 1.

Frequencies of clones with Mot defectsa

CloneNo. of Lac+ clones screenedNo. of Lac+ Mot clones observedNo. of Lac+ Mot clones/total no. of Lac+ clones (%)No. of Lac clones screenedNo. of Lac Mot clones observedNo. of Lac Mot clones/total no. of Lac clones (%)Ratio of Lac+ Mot clones/Lac Mot clones
FC1383 (dinB+)1,53690.581,4280<0.07>8b
FC1394 (dinB mutant)1,2170<0.08 (>7d)1,2480<0.08 (NAe)NAc (>8)
  • a The Yates correction for small numbers was used (48). Values in parentheses are ratios of the value for FC1383 to the value for FC1394. NA, not applicable.

  • b The difference in the frequencies of Mot mutant among the Lac+ and Lac clones of FC1383 is significant (χ2 = 6.5, P = 0.01).

  • c To make this ratio significant at the 5% level, 6 of the 1,217 Lac+ clones screened would have had to be Mot.

  • d The difference in the frequencies of Mot mutants among the Lac+ clones of FC1383 and FC1394 is significant (χ2 = 5.5, P = 0.02).

  • e To make this ratio significant at the 5% level, 7 of the 1,428 Lac clones of FC1383 screened would have had to be Mot.