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

, : Linkage analysis of seventeen loci in poeciliid fish (genus Poeciliopsis). Journal of Heredity 73(1): 19-23

Electrophoretic surveys of genetic variation reveal considerable levels of polymorphism in most species. Only rarely 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 4 spp. of fish in the genus Poeciliopsis P. monacha, P. viriosa, P. lucida and P. occidentalis . Five loci are in 1 linkage group; 2 loci are in a 2nd group. The remaining 10 loci assort independently. Finding 5 of 17 loci in a single linkage group is unexpected since there is no reason to expect that polymorphic loci would be clustered in an organism with a large number of chromosomes in the haploid set. Comparisons of the genetic map of Poeciliopsis with the maps in the related genera Xiphophorus and Poecilia indicate that the above linkage relationships were conserved during the divergence of 3 genera of poeciliid fish.


PMID: 7069186

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