Which genetic mechanism is most likely responsible for the evolutionary origin of new and complex plant structures, such as flowers?

Question

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Gene duplication is a major mechanism by which new genetic material is generated during molecular evolution. It allows for one copy of a gene to acquire mutations and potentially gain new functions without losing the original function of the duplicated gene, leading to the development of new and complex structures, such as flowers in plants.

Which Genetic Mechanism Is Most Likely Responsible for the Evolutionary