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EVIDENCE OF RELATIONSHIP BETWEEN EXTRA DIMINUTIVE CHROMOSOMES IN GEOGRAPHICALLY REMOTE RACES OF OENOTHERA
Author(s) -
Cleland Ralph E.,
Hyde Beal B.
Publication year - 1963
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1963.tb07193.x
Subject(s) - biology , diminutive , chiasma , subgenus , oenothera , evolutionary biology , backcrossing , genetics , mimicry , chromosome , chromosome pairing , zoology , genus , linguistics , philosophy , gene
C leland , R. E. (Indiana U., Bloomington), and B. B. H yde . Evidence of relationship between extra diminutive chromosomes in geographically remote races of Oenothera. Amer. Jour. Bot. 50(2): 179–185. Illus. 1963.—Two California races of O. hookeri, Mono (from Mono Co.) and Mataguey (from San Diego Co.), have extra diminutive chromosomes. These diminutives do not associate with any of the normal chromosomes present. The extras from the 2 races, however, are able to synapse with each other and to form chiasmata, although the extras in Mono are distinctly larger than these in Mataguey . This suggests that they are at least partially homologous and that they have come from a common source. Two alternative hypotheses for their origin are suggested: (1) they have resulted from the loss of pairing ends through deletion, having descended from the same chromosome; (2) they represent normal chromosomes derived from another subgenus, through an inter‐subgeneric cross followed by a backcross to hookeri . The facts tend to favor the latter hypothesis.