Silent marker | Crossovers | Noncrossovers | ||
---|---|---|---|---|

Normal 4:4 | Conversion | Normal 4:4 | Conversion | |

PRM | 6 | 11^{a} | 18 | 11^{b}^{c} |

WRM | 2 | 15^{d} | 3 | 19^{d} |

The map distances for the bracketing interval

*LEU*-*URA*were 11.8 ± 1.1 cM and 11.3 ± 0.8 cM for the PRM and WRM crosses, respectively.↵

*a*Six 6:2, four 5:3, one 7:1 four-strand double crossover.↵

*b*Eight 6:2, three 5:3.↵

*c*For the PRM, the probability that chance alone could account for the excess of 4:4 segregants among the noncrossovers as compared with the crossovers (anticipated from previous studies; see text) is 0.07 (one-tailed Fisher exact test) and 0.04 (one-tailed*z*-test). If the 7:1 four-strand double crossover for the PRM were counted twice, the*P*-value for the Fisher exact test would be 0.05.↵

*d*All 6:2.