physical map

a map that identifies the physical location of genes on a chromosome, in contrast to a linkage map, which is generated by measuring recombination frequencies. Physical length can be measured in base pairs, kilobases, or megabases. Such maps are obtained using a variety of methods, e.g. pulsed field gel electrophoresis, fluorescence in situ hybridization, contig mapping using polymorphic markers, and by sequencing entire genomes.

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