Table 1. Non-Mendelian ratios of pups from heterozygous Btbd9 mutant mice interbreeding.

Genotype	Expected	Observed	Chi-square value	p-value
WT	20.5	35	-	-
Het	41	34	9.391	0.0022*
KO	20.5	13	10.083	0.0015*
Total	82	82	14.195	0.0008**

WT, Wild-type mice; Het heterozygous Btbd9 mutant mice; KO, homozygous Btbd9 mutant mice;

^*p<0.05,

^**p<0.001.