The Pacific Giant salamander, Dicamptodon tenebrosus, from the Pacific Northwest of North America has variable numbers of supernumerary chromosomes, from 0 to 10, per individual. B chromosome frequency among populations varies geographically such that salamanders from the most southern and northern regions have lower average numbers of B chromosomes than salamanders in the middle of the range. This variation in B frequency may be correlated with both historical and climatic factors. To assess how the supernumerary chromosomes originated in D. tenebrosus, B chromosome DNA was isolated by microdissection and amplified by degenerate oligonucleotideprimed PCR. The B DNA hybridized similarly to genomic DNA from individuals of D. tenebrosus and the related species D. copei and D. ensatus demonstrating that the supernumerary chromosomes were derived from the normal chromosome complement. Unique hybridization bands in both D. copei and D. tenebrosus suggest that the shared sequences have evolved independently.

Typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1983. / Bibliography: leaves 283-290. / Microfiche. / xix, 290 leaves, bound ill. 29 cm

Typescript. / Thesis (Ph. D.)--University of Hawaii, 1968. / Bibliography: leaf 82. / ix, 82 l tables

iv, 127 leaves : ill., photos, graphs ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1979) from the Dept. of Genetics, University of Adelaide

Thesis (Ph.D.)--Tufts University, 2004. / Adviser: Victoria H. Meller. Submitted to the Dept. of Biology. Includes bibliographical references (leaves 120-126). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

Diss. (sammmanfattning) Umeå : Univ., 2004. / Härtill 4 uppsatser.

Thesis (Ph. D.)--University of Adelaide, Dept. of Plant Science, 1995? / Includes bibliographical references (leaves 70-85).

Thesis (Ph.D.)-- University of Adelaide, Dept. of Genetics, 1999. / Copy of previously published article by author, inserted. Bibliography: leaves 217-233.

Thesis (M.S.)--Virginia Polytechnic Institute, 1955. / Vita. Includes bibliographical references (leaves 36-37). Also available via the Internet.

Thesis--University of Michigan, 1931. / Thesis note label mounted on t.p. "Papers from the Department of Botany, University of Michigan, nr 358." "Reprinted from ʻLa Cellule, ̓ volume XLI, fascicule 2, 1932." "Literature cited": p. [105]-108.