Biology / Bio 1559 · Atom · ~20 seconds
The Physical Map
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A physical map represents distance in nucleotides between genes or genetic markers along a chromosome, complementing the recombination-based genetic map.
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A physical map states a gene's distance from a marker in base pairs; a genetic map states that distance in recombination-derived map units.
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A genetic map's distances are recombination-derived; a physical map's are counted in nucleotides directly.