Different versions of the same gene can be either dominant or recessive. A small non-coding RNA mediates such differences in dominance as part of a system that prevents inbreeding in plants.
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Goring, D., Indriolo, E. How plants avoid incest. Nature 466, 926–927 (2010). https://doi.org/10.1038/466926a
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DOI: https://doi.org/10.1038/466926a
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