Multiple Choice
In methods for analyzing DNA (e.g., agarose gel electrophoresis), what is the primary purpose of a DNA size standard (DNA ladder)?
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18. Molecular Genetic Tools
Methods for Analyzing DNA
Multiple Choice
In the context of methods for analyzing DNA, how does polymerase chain reaction (PCR) relate to DNA fingerprinting?
A
PCR directly separates DNA fragments by size in a gel to produce the banding pattern used for DNA fingerprinting.
B
PCR cuts DNA at restriction enzyme recognition sites to create RFLP patterns used in DNA fingerprinting.
C
PCR amplifies specific DNA regions (often STR loci) so there is enough DNA to generate a detectable DNA fingerprint profile.
D
PCR determines the exact nucleotide sequence of an individual’s genome to create a DNA fingerprint.
Verified step by step guidance1
Understand that DNA fingerprinting relies on analyzing specific regions of DNA that vary between individuals, such as Short Tandem Repeats (STRs).
Recognize that PCR (Polymerase Chain Reaction) is a technique used to selectively amplify these specific DNA regions, increasing the amount of DNA available for analysis.
Note that PCR itself does not separate DNA fragments by size; instead, it produces many copies of the target DNA segments.
After PCR amplification, the DNA fragments are typically separated by size using gel electrophoresis to visualize the banding pattern characteristic of an individual's DNA fingerprint.
Therefore, PCR's role in DNA fingerprinting is to provide sufficient quantities of specific DNA regions to enable the generation of a clear and detectable DNA fingerprint profile.
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