The best replacement for dominance is codominance.

The best alternatives to dominance are rated as following:
★★★★★  codominance
★★  galvanizing ward
★★  incomplete dominance
★★  difference
★  epistasis
★  progesterone deficiency
★  submission
★  predominance
★  low estrogen
★  low progesterone
★  progesterone dominance
  hand dominance
  adrenal fatigue
  badge of dominance
  estrogen deficiency
  aggression
  complete dominance
  right brain dominance
  air superiority
  vitalization

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Speaking about dominance, one probably shouldn't forget about punnett squares.

Other search terms related to dominance and their ratings are:
★★★★★ punnett squares
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dominance
codominance
galvanizing ward