univalent

Definitions of univalent
  1. adjective
    having a valence of 1
    synonyms: monovalent
  2. adjective
    used of a chromosome that is not paired or united with its homologous chromosome during synapsis
    “a univalent chromosome”
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    antonyms:
    bivalent
    used of homologous chromosomes associated in pairs in synapsis
    multivalent
    used of the association of three or more homologous chromosomes during the first division of meiosis
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