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| Modern Genetic Analysis Chapter 6. Gene Interaction Interactions Between the Alleles of One Gene Figure 6-5. Apparatus for electrophoresis. Each sample is placed in a well in a gelatinous slab (a gel). The molecules in the samples migrate different distances on the gel owing to their different electric charges. Several samples are tested at the same time (one in each well). The positions to which the molecules have migrated are later revealed by staining.

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