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A genetic survey of mitochondrial DNA (mtDNA) in a hybridogenetic complex of fishes (genus Poeciliopsis) was conducted to assess the possibility of low-level paternal transmission of mtDNA to progeny. In this reproductive system, females of the unisexual hybrid biotype between P. monacha and P. lucida effectively participate in a perpetual backcross to males of a sexual species, P. lucida. As judged on the basis of numerous restriction digests, the mtDNAs of the bisexual parental species (P. monacha and P. lucida) were highly distinct, yet the mtDNA of the natural hybridogens was not different from that of P. monacha from the same river system. Since the hybridogens are probably thousands of generations old, the present results demonstrate that paternal leakage of mtDNA must be extremely low or absent in these fishes. MtDNA genotypic differences among hybridogenetic strains were also present and corresponded to geographic locale. These differences provide a foundation for estimation of both origins and phylogeny of the unisexual forms.

Mode of Inheritance and Variation of Mitochondrial DNA in Hybridogenetic Fishes of the Genus Poeciliopsis