A pair of homologous chromosomes which have joined together (are synapsed) during prophase I and metaphase I of meiosis.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.
Biv"a*lent (?), a. [L. bis twice + valens, p. pr. See Valence.] Chem.
Equivalent in combining or displacing power to two atoms of hydrogen; dyad.
© Webster 1913.
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