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Forensic scientists can use DNA in blood, semen, skin, saliva or hair found at a crime scene to identify a matching DNA of an individual, such as a perpetrator. This process is formally termed DNA profiling, but may also be called "genetic fingerprinting
".
In DNA profiling, the lengths of variable sections of repetitive DNA, such as short tandem repeats
and minisatellites, are compared between people. This method is usually an extremely reliable technique for identifying a matching DNA.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoIt depends on what you are looking for.
Basically, you want to replicate the DNA so you have many copies of it (millions of copies). You do this using a Polymerase Chain Reaction.
Once you have your copies, you can use specific enzymes to cut certain regions of the DNA, so that you analyze only the area you're interested in.
Finally, you label the DNA with a dye, and run it through a gel, using electrophoresis. This will separate the DNA segments by size, allowing for idenfication (if the gene(s) you are looking for already have a known size)
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How is DNA extracted from fossils what are the costs associated with testing DNA in fossils?
Fossils are the mineralised remains of organisms and contain no organic material.
What is a characteristic of mitosis and not of meiosis?
The daughter cells produced are genetcally identical. A mitosis divides cells, which still contains the same number on chromosomes. In mitosis DNA is replicated once, and the nucleus divides once. In meiosis DNA is replicated once, but the nucleus is divided twice.
Why is gel electrophoresis important?
To separate and analyze DNA fragments and protein fragments by weight. If you have digested some bacterial DNA, for instance, then you can tell by running the fragmented DNA in the gel whether you have digested the correct base length.
Does rubber gloves leave DNA?
Not likely. If a skin cell from your hand were to fall off and through the glove DNA could be left. Hair is also a source for DNA.
Are restriction enzymes used in gel electrophoresis?
For DNA gel electrophoresis, yes. Once the DNA is cut up into different-sized fragments, they can be electrophoresed to separate bands.
Could DNA extracted from onion be different from DNA extracted from cauliflower why?
Although DNA is composed of the same four nucleotides in all organisms, the sequence of nucleotides is different for each species
What food can DNA be extracted from?
DNA can be extracted from strawberries. DNA can be extracted from various things not just food because it is found in all living things.
What substances must DNA be purified from?
tissue from an organism that is living, or once lived. For example, DNA can be extracted from blood cells, hair, or skin cells, etc.
Where can one get his DNA extracted?
One can get his DNA extracted at a crime laboratory, at a police precinct, at a hospital, and even at home. DNA can be extracted by using a cotton swab in the inside of one's cheek or through a blood sample.
Which of the DNA typing techniques do you think you would choose if you had to analyze a DNA sample?
Which of the DNA typing techniques do you think you would choose if you had to analyze a DNA sample? Why?
Why chilled ethanol is added for DNA isolation?
to precipitate extracted DNA
How is an extracted DNA inserted into a new molecule?
DNA can be placed into to an egg but not into a molecule.
Is their a test for delta 32?
Yes, it is a DNA test which a sample of your saliva is taken by a buccal swab and then once your DNA is extracted, they use a PCR to find out if you carry the genetic mutation CCR5 Delta 32.
A virus may contain ethier DNA or RNA To identify which nucleic acicd is present a biochemist could chemically analyze the virus for the presence of which nitrogen base?
The "NA" in DNA and RNA stands for nucleic acid, so in this question, you are trying to find which nitrogen base ethier only DNA or only RNA has. DNA has thymine, but RNA has uracil. Therefore, the biochemist could chemically analyze the virus for the presence of uracil.
What is extracted from cells for DNA microarray technology?
mRNA is extracted from cells for DNA microarray. the mRNA is then converted in the lab to cDNA this cDNA is allowed to interact with the probes on the microarray chip
What is used to analyze DNA samples?
biotechnology. pwned
Can DNA get extracted from a sterile cotton pad with blood?
Yes. You can get DNA from sterile cotton pad with blood for DNA finger printing.
