TABLE 3

Analysis of coincident crossovers in adjacent intervals

Total
tetrads
Single intervalsbAdjacent intervalsObserved
StrainaURA3-LEU2LEU2-MATObservedcExpecteddexpectedP valuee
TID111410.2780.5430.1060.1510.700.0001
tid112010.1560.6090.0960.0951.010.85
DMC1-YEpRAD5412080.2280.5590.0810.1270.64<0.00001
dmc1Δ-YEpRAD5412490.1580.5100.0870.0811.070.37
  • a See column 1 of Table 1 for names of strains used.

  • b Frequency of T plus NPD tetrads for interval indicated.

  • c Observed frequency of tetrads that are either T or NPD for both the URA3-LEU2 and the LEU2-MAT intervals.

  • d “Expected” is the product of the frequencies given for the URA3-LEU2 interval and the LEU2-MAT interval.

  • e P values reflect the likelihood that the difference between the expected and observed frequencies is attributable to chance as determined by a χ2 test.