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The Journal of Heredity 1997:88(1):62-65
© 1997 The American Genetic Association 88:62-65

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Sources for Misclassifying Genealogical Origins in Mixed Hybrid Populations

J. M. Epifanio, and D. P. Phillipp

Department of Fisheries and Wildlife 13 Natural Resources Buildlng, Michigan State University, East Lansing, MI 48824-1222
Center for Aquatic Ecology, Illinois Natural History Survey Champaign, Illinois

Abstract

Expected genotype character arrays from advanced generation hybrids and backcrosses overlap arrays from parental crosses and first-generation hybrids. Therefore, assignment of hybrid offspring to a genealogical origin solely by genotype inspection is problematic. In several "best case" scenarios of assignment by inspection, where parental taxa display di agnostic alleles and matings are limited to the second generation of hybridization or backcrossing, we demonstrate classification error rates of 87% and 57% for the two and four locus cases, respectively The error rate decreases with additional loci and more than 13 loci may be required to reduce error rates below a 5% threshold. Departures from "best case" conditions will contribute additional error. These results support use of maximum-likelihood methods which can provide unbiased classification estimates and are more suitable for the examination of complex hybrid mixtures than assignment of genealogical origin by genotype inspection.


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