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- W1993313888 abstract "Parthenogenesis usually includes clonal inheritance, which is thought to increase the risk of the clonal populations' extinction. Yet many parthenogenetic organisms appear to have survived for extended periods. A possible explanation is that parthenogens occasionally reproduce through sex-like processes. Although there is indirect evidence for occasional sex, the underlying mechanisms are currently unknown. In the present study, we examined sex-like processes in the planarian flatworm Schmidtea (Dugesia) polychroa. Parthenogenetic forms of this species are simultaneous hermaphrodites that require sperm to trigger embryogenesis, whereas paternal genetic material is usually excluded from the oocyte (sperm-dependent parthenogenesis). Based on a comparison of parents and offspring, using highly polymorphic microsatellites, we demonstrate the incorporation of paternal alleles in about 5% of the offspring. We detected two distinct processes: chromosome addition and chromosome displacement. Such rare sexual processes may explain the long-term persistence of the many purely parthenogenetic populations of S. polychroa in northern Europe." @default.
- W1993313888 created "2016-06-24" @default.
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- W1993313888 date "2006-05-24" @default.
- W1993313888 modified "2023-10-11" @default.
- W1993313888 title "Paternal inheritance in parthenogenetic forms of the planarian Schmidtea polychroa" @default.
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- W1993313888 doi "https://doi.org/10.1038/sj.hdy.6800841" @default.
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