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

¹ Department of Zoology and Entomology, University of Connecticut, Storrs, Connecticut 06268

1. Hybridization experiments between an all-female fish, Poeciliopsis "Cx," and the males of two bisexual species, P. lucida and P. latidens, have provided genetic evidence that hereditary materials of both the mother and the father combine to form the F, progeny. The entire male genome, however, appears to be simply "on loan" for each generation. None of the male's chromosomes, apparently, are incorporated in the ova; thus, the integrity of the maternal line is maintained, even though the all-female form is forced to rely on sperm from other species to maintain itself.

2. This mode of reproduction provides an isolating mechanism as complete as that of parthenogenesis or gynogenesis.

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