Abstract
Li, Ning, and R. C. Jackson. (U. Kansas, Lawrence.) Cytology of supernumerary chromosomes in Haplopappus spinulosus ssp. cotula. Amer. Jour. Bot. 48(5): 419–426. Illus. 1961.—The behavior of supernumerary chromosomes was investigated in 2 plants. In 1, the number of supernumeraries was highly variable in both somatic and meiotic cells, presumably as a result of somatic non-disjunction. In the second plant, the number of supernumerary chromosomes was less variable, but an end-to-end association of a pair of supernumeraries and a regular bivalent was observed in a small percentage of the microsporocytes at zygotene and pachytene. This end-to-end association apparently resulted in a permanent fusion of the supernumerary and regular chromosome ends in some instances because the union persisted throughout both meiotic divisions. There was no evidence of normal pairing between the supernumeraries and regular chromosomes.
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