Xenopus tropicalis and Xenopus laevis are two closely related species of frog. X. laevis has two times the number of chromosomes as X. tropicalis. Biologists assume that the species X. laevis arose through:

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Polyploidy occurs when an organism has more than two sets of chromosomes. X. laevis having twice the number of chromosomes as X. tropicalis indicates that it likely underwent a polyploidy event, leading to the formation of a new species. Symatric speciation, reinforcement, and coevolution are not supported by the information given.

Xenopus Tropicalis and Xenopus Laevis Are Two Closely Related Species