TABLE 5

Tetrad types for conversions at met13

	ade5-KAN	KAN-lys5	lys5-NAT	HPH-cyh2	cyh2-crl3	crl3-trp5	trp5-leu1
Among 145  crossovers (cM)^a	33:106:4  (45.5 ± 4.0)	103:40:0  (14.0 ± 1.9)	124:20:0  (6.9 ± 1.4)	132:11:1  (5.9 ± 2.3)	69:68:7  (38.2 ± 5.3)	81:64:0  (22.1 ± 2.1)	92:51:1  (19.8 ± 2.8)
Among 166  noncrossovers (cM)^a	52:100:9  (47.8 ± 5.2)	105:55:0  (17.2 ± 1.9)	114:48:2  (18.3 ± 3.0)	143:22:1  (8.4 ± 2.2)	53:109:2  (36.9 ± 2.9)	98:65:1  (21.7 ± 2.6)	121:42:2  (16.4 ± 3.0)
χ² P	0.07	0.28	0.0009	0.18	0.0075	0.57	0.095
Significant SE (cM)^b	No	No	Yes	No	No	No	No

↵^a Centimorgans were calculated as in Table 1.
↵^b Significance of the difference between the estimated map lengths for the crossover and the noncrossover met13 conversions (see materials and methods).