Table 1. Crossing over requires linear element component Rec10 and sister chromatid cohesins Rec8 and Rec11.

		Nominal cM*	rec+	rec10Δ		rec8Δ		rec11Δ
Chr.	Interval		cM†	cM	Red'n‡	cM	Red'n	cM	Red'n
I	lys3-ura1	34	25	0.2	120	2.5	10	1.8	14
I	ura1-pro1	42	27	0.5	50	5.9	4.6	4.0	6.8
I	lys3-pro1	76	57	0.7	80	6.7	8.5	6.3	9.0
I	ura1-lys7	601	—§	1.1	600	31	20	76	7.9
II	pat1-leu1	47	58	ND	ND	2.2	26	ND	ND
II	lys4-his4	12	15	0.2	75	1.6	9.4	2.7	5.6
II	his4-arg4	74	53	1.2	44	8.2	6.5	15	3.5
II	arg4-trp1	54	47	ND	ND	2.6	18	2.1	22
III	ura4-ade6	197	—	1.1	180	2.2	90	6.5	30
III	ade6-arg1	47	73	<0.4	>180	0.8	90	0.7	100
III	arg1-ade5	128	—	ND	ND	4.1	31	8.2	16
III	ura4-arg1	244	—	0.8	>300	5.0	49	11.1	22
III	ura4-ade5	372	—	ND	ND	9.4	40	22.2	17

ND, not determined; Red'n, reduction.

^*Calculated from the physical distance (23) and the genome average of 0.16 cM/kb (16).

^†Calculated from the observed recombinant frequency (Table 4) and Haldane's mapping function: x = −50 ln(1-2R), where x = genetic distance in centimorgans (cM) and R = fraction of recombinant spores among total spores analyzed.

^‡Factor by which the observed genetic distance in the indicated mutant is less than that observed in wild type or, for values >75 cM, the nominal distance.

^§Observed recombinant frequency too close to 50% for reliable calculation of genetic distance.