Question

Why is molecular diagnosis preferred over conventional methods ? Name any two techniques giving one use of each.

Answer 1

To allow early detection 

Example rDNA (recombinant-DNA) technology/ PCR/ELISA/Probe (any two) PCR (polymerase chain reaction) to detect low concentration of bacteria/virus (HIV)

ELISA to detect antigens / to detect antibodies produced by those antigens / to detect IIIV widely  used diagnostic test for AIDS Probe-to detect a mutated gene (from a normal one) (any two corresponding functions)