Why has STR become the method of choice over DNA fingerprinting when identifying a person of interest?
A) STR is less expensive.
B) STR doesn't require the use of restriction enzymes.
C) The STR sample does not require amplification.
D) STR requires the use of gel electrophoresis.
E) STR can determine the order of nucleotides in a gene.

Question

Quizplus · Accepted Answer

STR (short tandem repeat) analysis does not require the use of restriction enzymes, which are used in DNA fingerprinting to cut DNA into fragments. STR analysis uses PCR (polymerase chain reaction) to amplify specific areas of the DNA that contain repeated sequences, which are then separated based on their size using gel electrophoresis. This method is quicker, more reliable, and less prone to errors than DNA fingerprinting. Additionally, STR analysis can work with smaller or degraded samples, making it more practical for forensic applications.

Why Has STR Become the Method of Choice Over DNA