TABLE 3.

Crossover formation in the different genetic backgrounds^a

Strain	Total no. of GCs	Crossovers		SE
		No.	%
WT (Th805)	104	13	12.5	3.2
rhp51Δ	38	0	0.0	0.0
rhp57Δ	51	15	29.4	6.4
swi5Δ	158	6	3.8	1.5
rhp57Δ swi5Δ	32	0	0.0	0.0
eme1Δ	70	1	1.4	1.4
eme1Δ rhp57Δ	44	2	4.5	3.1
eme1Δ swi5Δ	88	3	3.4	1.9
rqh1Δ	79	32	40.5	5.5
rqh1Δ rhp51Δ	16	0	0.0	0.0
rqh1Δ rhp57Δ	30	0	0.0	0.0
rqh1Δ swi5Δ	113	37	32.7	4.4
swi5Δ eme1Δ rqh1Δ	92	33	35.9	5.0
rqh1 K547I	68	25	36.8	5.8
rqh1 K547I rhp57Δ	114	6	5.3	2.1
top3-15	71	17	23.9	5.1
eme1Δ top3-15	110	17	15.5	3.4

^aPFGE was used to determine whether colonies that had repaired the DSB by GC had experienced a crossover. These data represent the results of a minimum of three independent experiments. The standard error for each strain was calculated assuming crossover percentage as a binomial variable. For comparisons discussed in the text a Pearson χ² test was performed.