Which one of the following techniques has helped to solve many mysteries involving murders,robberies and rapes?

In density gradient centrifugation,bulk $DNA$ forms a/an ......,while satellite $DNA$ forms a/an ...... .

Select the appropriate option for $DNA$ fingerprinting.

In Northern blotting,$RNAs$ are separated by gel electrophoresis and the $RNA$ bands are transferred onto a membrane of:

The basis of $DNA$ fingerprinting is .............

$A$: Unknown $DNA$ after hybridization with $VNTR$ probe,the autoradiogram gives many bands of differing sizes in $DNA$ profiling.
$R$: These bands represent the $DNA$ fingerprint of the organism.