These karyograms were prepared by Dr. G.F. Shields, Department of Botany and Zoology, University of Toronto, Toronto, Ontario. The materials for the karyotypes were prepared from primary tissue cultures of kidney cells obtained by G.F. Shields. These birds were live-trapped at various locations in the province of Ontario. This species, as do various other species of Junco, possesses chromosomal polymorphisms: one involving chromosome number 2 and another involving chromosome number 5 (Shields, 1973) . These polymorphisms are shown in the male; however, the female has the standard karyotype.
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