Epistasis, Pedigree Analysis and the Genetics of Sex

Outlines of types of epistasis are included.

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1 aabb (wrinkled, green)

1. Dominant Epistasis (12:3:1)

Ex. B produces pigment > black
A prevents deposition of all pigments > white

If you cross: AaBb * AaBb

9 AABB or AABb or AaBB or AaBb (white)
3 AAbb or Aabb (white)
3 aaBB or aaBb (black)
1 aabb (unknown phenotype)

white:black:unknown phenotype > 12:3:1

2. Recessive Epistasis (9:3:4)

Ex. B produces pigment > black
aa prevents deposition of all pigments > white

If you cross: AaBb * AaBb

9 AABB or AABb or AaBB or AaBb (black)
3 AAbb or Aabb (unknown phenotype)
3 aaBB or aaBb ...