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is a self-fertilising species that became self-compatible 50,000 to 100,000 years ago. Arabidopsis thaliana is a predominantly self-fertilising plant with an out-crossing rate in the wild of less than 0.3%; a study suggested that self-fertilisation evolved roughly a million years ago or more in A. thaliana. In long-established self-fertilising plants, the masking of deleterious mutations and the production of genetic variability is

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