Self-incompatibility: In angiosperms, self-incompatibility is a mechanism that prevents self-fertilization within a flower, between flowers of the same plant, or of a genetically related plant.
It has been favored in certain species to promote genetic mixing. It should not be confused with genetically controlled physical or temporal mechanisms that prevent self-pollination, such as heterostyly and successive hermaphroditism (dichogamy)....
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