Distinct functions of S. pombeRec12 (Spo11) protein and Rec12-dependent crossover recombination (chiasmata) in meiosis I; and a requirement for Rec12 in meiosis II

Table 2 Aberrant segregation patterns of all three chromosomes within individual meiotic products.

Type of segregation error^a			Number of spores with segregation error
Chr. I	Chr. II	Chr. III	rec12-117	rec12-D15	rec12-Y98F
MI	MI	MI	12	18	0
MII	MI	MI	9	4	0
MI	MII	MI	0	3	0
MII	MII	MI	9	24	1
MI	MI	MII	10	5	0
MII	MI	MII	14	1	6
MI	MII	MII	7	3	0
MII	MII	MII	19	9	43
		n=	80	67	50

^aThe inferred type of segregation error for each chromosome within each diploid spore colony was determined by the analysis of centromere-linked markers as in Figure 5E. MI, heterozygous; MII, homozygous centromere-linked marker. The strains crossed were: WSP1807 × WSP1216; WSP1825 × WSP1884; and WSP1670 × WSP1809. Strain genotypes are provided in Table 3.