Answer: bivalence

AnswerCrossword Clue
bivalencea. having a valence of two b. having two valences, as aluminum with valences of two and three
bivalencepertaining to associations of two homologous chromosomes
bivalencepair of bivalent chromosomes, esp. when pairing during meiosis
bivalencethe state of being bivalent, having a valency of two also BIVALENCY