title: The effect of accessory chromatin on chiasma distribution in maize.
abstract: From an analysis of metaphase I bivalent configurations in Zea mays L. it was possible to determine the effects of two supernumerary elements on chiasma formation. Both the B chromosome and abnormal chromosome 10 increased chiasma frequency. In addition to enhancing total exchanges, both elements caused a redistribution of chiasmata from distal to more proximal locations.
mesh_terms: D002843:Chromatin / Q000502:physiology*; D002875:Chromosomes / Q000648:ultrastructure*; D008938:Mitosis; D003313:Zea mays / Q000648:ultrastructure*
chemical_list: D002843:Chromatin