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B chromosomes are additional genetic elements to the standard complement. During diakinesis, an unusual meiotic configuration was observed, revealing proximity between the bivalent and chromosome B (univalent) that might be the result of a heterochromatin affinity between these chromosomes. In anaphase I, late migration of B chromosomes was detected. The low frequency of B chromosomes in the Cichlidae family and in Crenicichla suggests its recent origin in this group and may be ascribable to animal exposure to deleterious effects under certain environmental conditions.
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