Gynogenesis and Triploidy in the Viviparous Fish Poeciliopsis

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Science  29 Sep 1967:
Vol. 157, Issue 3796, pp. 1564-1567
DOI: 10.1126/science.157.3796.1564


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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