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Autopolyploidy

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Autopolyploidy occurs when an individual carries multiple chromosome sets from its own species alone, immediately isolating it from the ancestral, non-polyploid population.

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A plant producing diploid gametes instead of haploid ones can self-pollinate or mate with other autopolyploids to found an isolated tetraploid lineage.

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An autopolyploid individual can no longer produce fertile offspring with the ancestral population, isolating it in one generation.