Table 1. Weight of 18.5 dpc fetuses on maternal and paternal inheritance of the (mChβGI)_2.

	Mean wet weight (g) ± s.d. (n) (range) (% of +/+ weight)
	fetus	placenta
+/+∧	1.313±0.098 (24) (1.166∼1.530)	0.066±0.009 (24) (0.053∼0.096)
-(M)/+∧	1.293±0.155 (24) (0.871∼1.511) (98.5%)	0.060±0.008 (24) (0.047∼0.077) (90.9%)
+/+‡	1.436±0.128 (13) (1.233∼1.593)	0.057±0.014 (13) (0.046∼0.101)
+/−(P)‡	0.635±0.055 (9) ¶ (0.571∼0.718) (44.2%)	0.032±0.007 (9) ¶ (0.024∼0.044) (56.1%)
+/+*	1.465±0.117 (19) (1.267∼1.692)	0.062±0.022 (19) (0.038∼0.109)
+/−(P)*	0.653±0.068 (16) ¶ (0.497∼0.755) (44.5%)	0.046±0.019 (16) $ (0.022∼0.083) (74.2%)
+/+†	1.126±0.194 (14) (0.873∼1.539)	0.077±0.011 (14) (0.057∼0.092)
+/−(P)†	0.564±0.071 (18) ¶ (0.486∼0.705) (50.1%)	0.038±0.006 (17) ¶ (0.030∼0.051) (49.4%)

∧ Sibling from -/(M) ♀ X +/+ ♂ matings.

^‡Sibling from +/+ ♀ X +/−(P) ♂ matings.

^*Sibling from +/+ ♀ X +/−(P chimera #2) ♂ matings.

^†Sibling from +/+ ♀ X +/−(P) ♂ matings. +/+ females were from transgenic line TgOG2.

¶ P<0.0001.

$ P<0.025.

(M), Maternal allele; (P), Paternal allele.