XIX.—Chromosome Linkage and Syndesis in Œnothera

Abstract
Despite all the evidence to the contrary, attempts have been made recently to bring Œnotheran cytology into lino with the parasynaptic theory of meiosis. Boedijn (2, 3) has described a peculiar conjugation of the chromosomes which he identifies as parasynaptic; Kihara (23) prefers to suppose the “doppelketten” origin of chromosome rings, such as he has found inRumex; while Darlington (7) has put forward an extension of Belling's (1) hypothesis of segmental interchange.

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