. 2005 Jan;169(1):485–488. doi: 10.1534/genetics.104.031971

TABLE 2.

Components of digenic epistasis contributing to genetic differences among subpopulations ofW. smithiiselected for long and short critical photoperiods

	Digenic epistatic effects^a
Subpopulation	A × A	A × D	D × D
Streamside
Coefficients	0.00733^A	0.253^MN	−0.0254^X
t-test^b	1.71^NS	7.90***	4.08***
Backwater
Coefficients	0.0163^A	0.0289^M	−0.0609^Y
t-test	3.43***	6.68***	8.61***
Sandy bog
Coefficients	−0.0187^B	0.0158^N	0.0431^Z
t-test	3.09***	4.24***	5.54***

^{^a}

Coefficients for the components of digenic epistasis: A × A, additive by additive; A × D, additive by dominance; D × D, dominance by dominance; within each column, coefficients followed by the same letter do not differ by Wald χ² (Fox et al. 2004); significant differences: M vs. N, P < 0.05; A vs. B and X vs. Y vs. Z, P < 0.001.

^{^b}

t-test for significant effect of the components of digenic epistasis: ^NSP = 0.089, ***P < 0.001.