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Biology — Modes of Speciation

Allopatric and sympatric routes to new species.

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digraph Speciation {
  rankdir=TB;
  node [shape=box, style=rounded];
  Population -> Allopatric [label="geographic barrier"];
  Population -> Sympatric [label="no barrier"];
  Allopatric -> "Reproductive isolation";
  Sympatric -> "Reproductive isolation";
  Sympatric -> "Polyploidy (plants)";
  "Reproductive isolation" -> "New species";
  "Polyploidy (plants)" -> "New species";
}