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==Evolution==
▲{{See also|Autogamy Depression}}
The evolutionary shift from outcrossing to self-fertilization is one of the most frequent evolutionary transitions in plants.
Since autogamy in flowering plants and autogamy in unicellular species is fundamentally different, and plants and protists are not related, it is likely that both instances evolved separately. However, due to the little overall genetic variation that arises in progeny, it is not fully understood how autogamy has been maintained in the tree of life.
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