TABLE 3

Coefficients of coincidence in isogenic MMS4 and mms4 diploids

Coefficient of coincidence (no. observed DCOs/no. expected DCOs)a
StrainHIS4-LEU2 LEU2-CENIIILEU2-CENIII CENIII-MATLYS5-MET13 MET13-CYH2MET13-CYH2 CYH2-TRP5CENVIII-THR1 THR1-CUP1
MMS4 0.45 (9/20)1.00 (25/25)0.50 (14/28)0.74 (40/54)0.58 (38/66)
mms4 0 (0/4)1.10 (5/4)0.50 (6/12)0.83 (20/24)0.46 (11/24)
  • a The coefficient of coincidence is the number of observed double crossovers (DCOs) divided by the number of expected DCOs. The expected number is calculated by assuming that crossovers in adjacent intervals occur independently of each other using the following equation: (TI + NPDI/totalI)(TII + NPDII/totalII)(total no. tetrads). I, interval I; II, interval II; T, tetratype; NPD, nonparental ditype. The observed number is based on those asci in which either a T or an NPD has occurred in both I and II.