Journal Article

A Tetraploid Amazon Molly, <i>Poecilia formosa</i>

Kathrin P. Lampert, Dunja K. Lamatsch, Petra Fischer and Manfred Schartl

in Journal of Heredity

Published on behalf of American Genetic Association

Volume 99, issue 2, pages 223-226
Published in print March 2008 | ISSN: 0022-1503
Published online January 2008 | e-ISSN: 1465-7333 | DOI: http://dx.doi.org/10.1093/jhered/esm102
A Tetraploid Amazon Molly, Poecilia formosa

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Polyploidization is thought to be an important driving force in evolution as it increases the genetic material on which mutation and selection can act. In the Amazon molly, Poecilia formosa, triploid genotypes can be found in the field and frequently arise from diploid breeding stocks, a tetraploid individual, however, was so far never documented. Here, we report the first tetraploid Amazon molly. Flow cytometry clearly showed the tetraploid DNA content, whereas microsatellite analysis not only confirmed the tetraploidy but also pointed to allotetraploidy. Most likely the fourth genome was received through paternal leakage, namely, by fertilization of a triploid egg with a haploid sperm. The existence of tetraploid individuals offers new explanations for the enormous clonal diversity observed in wild populations of P. formosa.

Journal Article.  2276 words.  Illustrated.

Subjects: Genetics and Genomics

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