Biology / Bio 1691 · Atom · ~20 seconds
Speciation Defined
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Speciation is the formation of two or more descendant species from one ancestral population, requiring reproductive isolation between the resulting populations.
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One ancestral population splitting into two populations that no longer interbreed, even if later reunited, has undergone speciation.
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Speciation requires reproductive isolation to take hold — geographic separation alone, without isolation persisting, does not complete the process.