TABLE 2.

Crossover distribution in wild-type and Msh6 mutants

Interval	I	II	III	IV	V	VI	VII	VIII	IX	X	XI
Size (bp)	424	511	269	31	10	376	443	1057	304	191	164
Wild-type COs	10	12	7	0	0	8	13	32	8	7	1
Msh6 COs	9	3	8	0	1	3	3	16	4	2	2

The 3.8-kb region between the ry⁶⁰⁶ and ry⁵³¹ mutant sites was divided into 11 intervals defined by the 10 polymorphisms in this region (Figure 1, supplemental Table S1 at http://www.genetics.org/supplemental/). Intervals are listed in chromosomal order from left (ry⁶⁰⁶ mutation) to right (ry⁵³¹ mutation). The exchange positions of 105 COs from wild-type females and the 51 class I COs from Msh6 mutants were determined by PCR and sequencing. The number of COs with an exchange in each interval is given. The distributions are not significantly different from one another (P = 0.37).