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Home Q & A Board Biology-Related Homework Help General Biology
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gh1991 gh1991
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13 years ago
what property of DNA allows it to be separated  by size using gel electrophoresis?
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#1
Educator
13 years ago
Welcome back,

DNA has an overall negative charge. When they are placed in a gel, an electric field is created across the gel. The negative DNA is attracted towards the positive electrode, and away from the negative electrode. The fragments are usually sorted by size; the smallest pieces usually move the furthest, while the longer, heavier pieces don't move far from the wells.
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