Definition of bivalent in English:



  • 1Biology
    (of homologous chromosomes) associated in pairs.

    • ‘Note that the bivalent sex chromosome remaining in the vicinity of the equator appears to be oriented to the poles.’
    • ‘A bivalent B chromosome was removed directly from a pachytene slide by a micromanipulator.’
    • ‘Because only homologous chromosomes pair, allopolyploids strictly exhibit bivalent formation (two chromosomes pair) at meiosis and undergo disomic inheritance for each locus.’
    • ‘If chromosomes 1 and 2 are genetically more identical, as are chromosomes 3 and 4, there are three different combinations for the bivalent chromosome pairing.’
    • ‘Slides containing F 2 worms were screened for the presence of worms with diakinesis nuclei exhibiting more than six chromatin masses (indicating failure in bivalent formation).’
  • 2Chemistry

    another term for divalent
    • ‘Using strips of sister holograms from one slide, we made a range of measurements of various mono- and bivalent ions.’
    • ‘The bivalent cations were slightly increased as well as chloride and phosphate.’
    • ‘It causes the cell wall to become rigid by blocking free carboxyl groups that interact with bivalent ions like Ca 2 +.’
    • ‘A comparison of the effect of monovalent counterions and bivalent counterions is a subject of our future work.’
    • ‘The surface of BR is bound with bivalent metal cations, charge amino acids and polar phospholipids to form an asymmetrical distribution of charges on the membrane surface.’


  • A pair of homologous chromosomes.

    • ‘An additional line drawing to the side depicts the spatial arrangement of the bivalent corresponding to LG - 02 and the FISH signals associated therewith.’
    • ‘True non-disjunction as a mechanism causing aneuploidy was separately assessed when a bivalent was found in a set of metaphase II chromosomes.’
    • ‘On average, each double-crossover bivalent produces one double-crossover chromosome (of four) in the absence of chromatid interference.’
    • ‘Three properties of meiotic chromosomes act to form a bivalent that will undergo proper reductional division.’
    • ‘However, no investigation has been made into whether homologous chromosome pairs or bivalents with altered patterns of recombination events may also be at increased risk for nondisjunction in mammals other than humans.’


Mid 19th century: from bi- ‘two’ + Latin valent- being strong (from the verb valere).