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Genetics, Vol 130, 621-628, Copyright © 1992
INVESTIGATIONS |
Mode of Origin and Sources of Genotypic Diversity in Triploid Gynogenetic Fish Clones (Poeciliopsis: Poeciliidae)
J. M. Quattro, J. C. Avise and R. C. Vrijenhoek
Center for Theoretical and Applied Genetics, Rutgers University, New Brunswick, New Jersey 08903-0231 Present address: Hopkins Marine Station, Stanford University, Pacific Grove, California 93950.
Most tributaries of the Rio Fuerte in northwestern Mexico contain one or more clones of allotriploid fish of the genus Poeciliopsis. We used multilocus allozyme genotypes and mitochondrial DNA (mtDNA) haplotypes to examine several potential modes of origin of these gynogenetic all-female fish. The allozyme studies corroborated earlier morphological work revealing the hybrid constitution of two triploid biotypes, Poeciliopsis 2 monacha-lucida and Poeciliopsis monacha-2 lucida. Each biotype carries one or two whole genomes from the each of the sexual species P. monacha and P. lucida. Restriction site analysis of mtDNA revealed that P. monacha was the maternal ancestor of five electrophoretically distinguishable triploid clones. Four of five clones were marked by closely related, composite, allozyme/mtDNA genotypes, suggesting they had common origins from an allodiploid clone of the P. monacha-lucida biotype. Genotypic analysis revealed that all five clones arose via the ``genome addition'' pathway. Fertilization of unreduced ova in P. monacha-lucida females by sperm from P. monacha and P. lucida males, respectively, gave rise to both biotypes.
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