Table 3. Chromosome abnormalities from cohesion heterozygotes and wild-type siblings.

Female
	Smc1b +/+	Smc1b +/−	Rec8 +/+	Rec8 +/−
Diakinesis/MI
Total Cells	37	72	57	48
Normal	37 (100.0%)	68 (94.4%)	57 (100.0%)	46 (95.8%)
Univalents	0	1 (1.4%)	0	0
St. Abnormal*	0	3 (4.2%)*	0	2 (4.2%)
MII Arrested eggs
Total Cells	27	45	33	90
Normal	25 (92.6%)	33 (73.3%)	31 (93.9%)	78 (86.6%)
Hyperploid	1 (3.7%)	0	0	1 (1.1%)
PSCS**	1 (3.7%)	10 (22.2%)	2 (6.0%)	9 (10.0%)
St. Abnormal	0	2 (4.4%)	0	2 (2.2%)

^*Structural abnormalities (MI abnormalities include 3 cells with chromatid breaks, 1 cell with a chromosome break, and 1 cell with an end-to-end fusion between two bivalents. All MII abnormalities were chromatid breaks).

^**Premature sister chromatid separation.