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Sexual selection is a mechanism of evolution in which members of one sex choose mates of the other sex to mate with, and compete with members of the same sex for access to members of the opposite sex. It is an accepted concept in animal evolution, but it is more controversial in botany. Sexual selection in plants could work through two principal mechanisms:Intra-sexual (male–male) competition: Competing pollen donors vie for ovule fertilization via traits such as pollen packaging, timing of release, and flower morphology.
Female or pistil-mediated mate choice: Post-pollination filters—such as pollen-recipient compatibility, pollen-tube growth rates, and selective seed abortion — enable differential siring success.
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