The Forked-Line Method
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The forked-line method diagrams a multi-trait cross by branching each trait's probability separately, then multiplying across branches, avoiding an unwieldy full Punnett square.
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A trihybrid cross's forked-line diagram branches first by seed color, then by seed shape, then by plant height, multiplying probabilities along each path.
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The forked-line method assumes independent assortment at every branch — linked loci break its multiplication step.