Table 3.

Allele frequencies in offspring of iv^+/− Nodal^+/− × iv^−/− Nodal^+/+ cross.

n = 202	Conv. expected	SSIS expected	Observed
Iv−/−	1/3 = 67.3	3/7 = 86.6	66
Nodal+/−	1/2 = 101	4/7 = 115.4	103
iv−/− and Nodal+/−	1/6 = 33.7	2/7 = 57.7	32