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If genomic DNA is highly degraded before restriction digest, how can the result look?

Answer and explanation

Correct answer: A smear with unclear fragments

The governing concept is that restriction analysis assumes the starting genomic DNA is sufficiently intact. Highly degraded DNA has already been broken into many pieces of different and often overlapping lengths before the restriction enzyme is added. Digestion then acts on this damaged mixture, so the gel may show a broad smear, diffuse signal, or poorly resolved fragments instead of a reproducible band pattern. The exact appearance depends on the degree of degradation and fragment distribution. Option A is correct. A perfect single band is not expected from heterogeneous genomic fragments; enzyme treatment is still relevant to the experiment, and DNA does not appear as a protein band. Checking an undigested sample first helps distinguish pre-existing degradation from incomplete digestion or other technical problems.

Related tags

Degraded Genomic DnaSmearRestriction DigestCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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