Tetraploid Origin of the Karyotype of Catostomid Fishes

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Science  11 Feb 1972:
Vol. 175, Issue 4022, pp. 644-646
DOI: 10.1126/science.175.4022.644


Catostomid fishes appear to have 2n(→4n?) ≃ 100 chromosomes. The Cyprinidae, from which catostomids probably diverged before the Eocene, usually have 2n = 48 or 50 chromosomes. Preliminary cytophotometric measurements indicate an approximate doubling of DNA content of cells among catostomids.