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bivalent
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bivalent

In biology, a name given to the pair of homologous chromosomes during reduction division (meiosis). In chemistry, the term is sometimes used to describe an element or group with a valency of two, although the term ‘divalent’ is more common.
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Several asymetric bivalents were clearly observed, formed by one chromosome with C-heterochromatin (one or two C-blocks) and another without C-heterochromatin (Figure 4).
Genomic changes of Chagas disease vector, South America by Perez, Ruben / Emerging Infectious Diseases
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