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In order to identify the person who committed a crime, forensic experts will need to extract DNA
from the tissue sample collected at the crime scene and conduct one of the following procedures for DNA finger-printing analysis
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- cut the DNA and hybridize with specific micro-satellite probes
- cut the DNA and subclone the fragments
- determine the sequence of the subclones
- (b) followed by (c)
Correct Option: A
The vast majority of a human’s DNA will match exactly that of any other human, making distinguishing between two people rather difficult. DNA finger printing uses a specific type of DNA sequence, known as a microsatellite, to make identification much easier. Microsatellites are short pieces of DNA which repeat many times in a given person’s DNA. In a given area, microsatellites tend to be highly variable, making them ideal for DNA finger printing. By comparing a number of microsatellites in a given area, one can identify a person relatively easily.
