Biology / Bio 1795 · Atom · ~20 seconds
Branch Length Does Not Default to Encoding Time
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A tree's branches typically show only the order events occurred in, not the time each represents, unless stated otherwise.
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Two branches of different lengths on an unlabeled tree can represent the same time span, since length defaults to ordering, not duration.
Watch for
Reading branch length as elapsed time is a mistake unless the tree states it is drawn to a time scale.
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