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Related to bivalent chromosome: Meiosis 1
a pair of chromosomes temporarily united.
bi·va·lent chro·mo·some(bī-vā'lĕnt krō'mŏ-sōm)
A pair of chromosomes temporarily united.
A double chromosome resulting from the conjugation of two homologous chromosomes in synapsis, which occurs during the first meiotic division.
See also: chromosome