AP Biology· difficulty 1/5
A river forms across the range of a rodent species, splitting it into two populations.
The diagram illustrates which mode of speciation?
Allopatric speciation
Parapatric speciation
Peripatric reinforcement
Sympatric speciation
Explanation
Allopatric speciation is driven by a geographic barrier (the river) physically isolating two populations so gene flow ceases and divergence proceeds independently.
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