Biology / Bio 1815 · Atom · ~20 seconds
Horizontal Gene Transfer, Defined
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Horizontal gene transfer moves genetic material between unrelated species by a mechanism other than parent-to-offspring reproduction, complicating a strictly branching tree.
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A gene moving directly from one unrelated bacterial species into another, rather than parent to offspring, is horizontal gene transfer.
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Horizontal gene transfer bypasses reproduction entirely — a distinct route for a gene to spread, separate from vertical inheritance.