RAPD vs. RFLP: Key Differences, Pros & Cons Explained
RAPD (Random Amplified Polymorphic DNA) fingerprints genomes with random primers and PCR; RFLP (Restriction Fragment Length Polymorphism) cuts DNA with enzymes and tracks length changes on gels.
Lab mates mix them because both spot genetic variation, yet one needs only nanograms of DNA while the other demands micrograms and radio-probes—confusion sparks when grant deadlines loom and budgets shrink.
Key Differences
RAPD is fast, cheap, and works on tiny, degraded samples but gives weak reproducibility. RFLP is labor-heavy, needs high-molecular-weight DNA and radioactive probes, yet delivers rock-solid, codominant markers perfect for court-level evidence.
Which One Should You Choose?
Screening hundreds of wild plant accessions? Pick RAPD for speed. Validating a forensic match or mapping disease loci? RFLP’s accuracy outweighs its hassle. Budget and DNA quality decide the winner.
Can RAPD results be trusted in court?
No—its poor reproducibility fails legal standards; courts favor RFLP or modern SNP panels.
Is RFLP obsolete today?
Largely yes; labs have shifted to faster PCR-based methods, yet RFLP still anchors old mapping studies.