HYBRIDIZATION EXPERIMENTS WITH AN ALL-FEMALE FISH OF THE GENUS POECILIOPSIS

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Abstract
All-female strains of the viviparous fish Poeciliopsis rely on males of bisexual species for fertilization. By mating one of these all-female strains to the male of a species (P. latidens) radically different from the female and from its usual mate (P. lucida), markers were provided by which the transmission of the paternal chromosomes could be followed in various hybrid combinations. It was established that characteristics of both parents are prominent in the F1 generation but only the maternal chromosomes are transmitted through the ova. The paternal chromosomes of each generation are believed to be eliminated in the polar bodies.