The organisms most likely to undergo sympatric speciation by polyploidy are:

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Polyploidy is more common in plants than in animals. This is because plant cells are able to tolerate multiple sets of chromosomes, whereas animal cells typically cannot handle the disruption in the balance of genetic material. Insects may also undergo polyploid speciation, but it is less common than in plants. Mammals, birds, and protists are unlikely to undergo polyploid speciation.

The Organisms Most Likely to Undergo Sympatric Speciation by Polyploidy