Question

dna evidence that is old or in poor condition can sometimes be salvaged and analyzed by using

rna
pcr amplification
dna from the mitochondria instead of the nucleus
gel electrophoresis

Explanation:

PCR (Poly - merase Chain Reaction) is a technique used to amplify small amounts of DNA. It can be used to salvage and analyze old or poorly - conditioned DNA by making multiple copies of the available DNA fragments. RNA is not used to salvage old or poor - condition DNA in this context. Using mitochondrial DNA instead of nuclear DNA is not the main method for salvaging old DNA here. Gel electrophoresis is used to separate DNA fragments by size after amplification or extraction, not for salvaging old DNA.

Answer:

PCR amplification