Approximately half of present-day plant species are believed to have originated in the past by which of the following events?

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Polyploidy, which involves a multiplication of the entire chromosome set, is believed to have played a significant role in the evolution of many plant species. It leads to the formation of a hybrid plant that is reproductively isolated from its parental species, allowing it to evolve and rapidly diversify into new species. Approximately half of present-day plant species are believed to have originated through polyploidy events. The other options, such as the proliferation of recessive genes, an increase in organismal sterility, or Ultraviolet radiation, are not involved in the origin and diversification of plant species to the same extent as polyploidy.

Approximately Half of Present-Day Plant Species Are Believed to Have