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";
}