Sympatric speciation is also known as

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(A) Sympatric speciation occurs when a new species evolves from a single ancestral species while inhabiting the same geographic region.One of the most

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Polyploidy

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(A) Sympatric speciation occurs when a new species evolves from a single ancestral species while inhabiting the same geographic region.One of the most common mechanisms for sympatric speciation,particularly in plants,is $Polyploidy$.$Polyploidy$ involves an increase in the number of chromosome sets,which creates an immediate reproductive barrier between the new polyploid individuals and the parent population,leading to speciation without geographic isolation.

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