Table 4. Genetic effects of SNP3593 for IDH activity.

Factor	Effect	P-value
A	0.4404	0.002
D	−0.1476	N.S.
d/a	−0.3350

Mode of action was calculated based on standardized IDH activity data from 26 inbreds and 61 hybrids from three different genetic backgrounds. a: additive effect; calculated as half of the difference between the means of lines homozygous for each allele. d: dominance deviation; calculated as the difference between the mean of lines heterozygous for SNP352 and the midpoint value of the two homozygous classes.