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The Journal of Heredity 1982:73(1):19-23
© 1982 The American Genetic Association 73:19-23

research-article

Linkage analysis of seventeen loci in poeciliid fish (genus Poeciliopsis)

James F. Leslie

Department of Zoology, The University of Iowa Iowa City, IA 52242

Abstract

Eleclrophoretic surveys of genetic variation reveal considerable levels of polymorphism in most species. Only rarely, however, are loci polymorphic in natural populations examined for their linkage relationships. Using inter- and intraspecific crosses, the linkage relationships of 17 loci were examined in four species of fish in the genus Poecilliopsis. Five loci are in one linkage group; two loci are in a second group. The remaining 10 loci assort independently. Finding five of 17 loci in a since linkage group is unexpected since there is no reason to expect polymorphic loci would be clustered in an organism with a large number of chromosomes in the haploid set. Comparisons of the genetic map of Poecillopsis with the maps in the related genera Xiphophorus and Poecilia indicate the above linkage relationships have been conserved during the divergence of three genera of poeciliid fish.


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M. Mateos and R. C. Vrijenhoek
Independent Origins of Allotriploidy in the Fish Genus Poeciliopsis
J. Hered., January 1, 2005; 96(1): 32 - 39.
[Abstract] [Full Text] [PDF]


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