Table 1.

CO maturation inefficiency accounts for almost all zero-CO aneuploidies.

	Zero-CO bivalents	Chromosome
13–16		18	21	22
A	Freq. observed (MLH1 foci)+	0.008	0.018	0.07	0.067
B	Freq. predicted with CO inefficiency*	0.016	0.015	0.09	0.07
C	Freq. predicted without CO inefficiency*	0	2×10−4	1.3×10−3	1.4×10−3
D	Increase due to CO inefficiency (A/C; B/C)	>100x	76x	70x	50x
	= reduction if CO inefficiency absent

⁺Data from Figure 2E;

^*Predictions from Figure 3D.