AaXAa
3:1
AaXaa
1:1
cBcW X cBcW
1:2:1
AaBb X AaBb
9:3:3:1
AaBb X aabb
1:1:1:1
AaBb X Aabb
3:3:1:1
AacBcW X AacBcW
6:3:3:2:1:1
Dominant epistasis
12:1:3
Recessive epistasis
4:3:9
Duplicative recessive epistasis
7:9
Duplicate dominance epistasis
1:15
Inhibitory epistasis
13:3