Catostomus commersoni (Lacépède) (White sucker) 2n = 100
Of the total karyotype of 100 chromosomes, about 24 are metacentrics and submetacentrics, while the remainder are acrocentrics and subtelocentrics. In view of the likelihood that this species is tetraploid, it should be possible to arrange these chromosomes in groupings of four. An examination of the karyotype indicates that this might be possible but, unfortunately, the homologues are not sufficiently different from each other to be sure of such grouping. There is no evidence of chromosomal sexual dimorphism, and in fact such would not be expected in view of the probable tetraploid origin.
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- 1).Uyeno, T. and Smith, G.: Tetraploid origin of the karyotype of catastomid fishes. Science 175: 644, 1972.Google Scholar