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If a fragment is very small in restriction digest, what issue can occur in ligation?

Answer and explanation

Correct answer: Recovery and quantification can be difficult

The governing concept is that DNA fragments must first be recovered and measured accurately before ligation. A very small fragment may migrate close to the dye front or diffuse during electrophoresis, making its band difficult to see. During gel extraction, it can also be lost through inefficient binding, transfer, or elution. Because the recovered amount is uncertain, the insert-to-vector molar ratio cannot be set reliably; too little insert may reduce recombinant formation, whereas excess insert may promote unwanted products. Therefore option A is correct. A small fragment does not become a protein, enzymes do not simply vanish, and the vector is not necessarily absent. Careful gel conditions, sensitive visualization, and quantitative measurement help reduce the problem.

Related tags

Small Dna FragmentGel ExtractionLigationProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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