Palaeontologists unearthed a human skull during excavation. $A$ small fragment of the scalp tissue was still attached to it. Only a little $DNA$ could be extracted from it. If the genes of the ancient man need to be analysed,the best way of getting a sufficient amount of $DNA$ from this extract is:
- ABy hybridizing the $DNA$ with a $DNA$ probe
- BBy subjecting the $DNA$ to polymerase chain reaction
- CBy subjecting the $DNA$ to gel electrophoresis
- DBy treating the $DNA$ with restriction endonucleases
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