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Science 29 September 1967:
Vol. 157. no. 3796, pp. 1564 - 1567
DOI: 10.1126/science.157.3796.1564
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Articles

Gynogenesis and Triploidy in the Viviparous Fish Poeciliopsis

R. Jack Schultz 1

1 Department of Zoology and Entomology, University of Connecticut, Storrs

Three all-female strains of the viviparous fish Poeciliopsis occur in the Río Fuerte of Sinaloa, Mexico. Poeciliopsis lucida, a bisexual species, provides sperm for these monosexual forms which I designate as Cx, Cy, and Cz. Form Cy is a triploid that when test-mated to males of various species produces all-female, triploid offspring devoid of paternal characters. Both Cx and Cz are diploid and express characteristics of both parents.


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Independent Origins of Allotriploidy in the Fish Genus Poeciliopsis.
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Coexistence of Clones in a Heterogeneous Environment.
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