I.e., you scratch the arms of 2 different people. Samples are taken from your under your fingernails.  Will the 2 different DNA samples be determined, or could they be 'mixed' causing it not to match?
124943
they isolate the two different strands.  think of it as looking in a lake and seeing a salmon and a bass.  even if you stir up the lake you still only see a salmon and a bass.
320842
You leave bits of cells everywhere you are, a person can carry a hair from another person stuck on his/her coat and then drop it off somewhere else.  If your question is that, for example in a crime, your hair might end up on top of a dead guy because the killer had contact with you prior to killing, the answer is yes, but investigators nowadays see right through that and will discard you quickly because one hair is not enough to link you.\n\nBut if your question is if dna can transfer from one person to another, then no, unless it's a virus that did a bit of recombination with your dna, but even if so, it's not significant.
630750
It doesn't matter in what order they go the lab, unless your specific lab has a protocol in place to make sure the specimens don't get lost.\n\nThe different labs do different things with the samples; they are not inter-related.
657483
"DNA" testing is not sequence testing.  DNA is made up of nucleic acids (A, C, G, T).  In typical testing, the sample (blood, saliva, hair, skin) is treated so that the DNA material within the cells are extracted.  However, to actually sequence it against a known sample would take ages (i.e. the human genome project).  What forensics testing does is actually subject DNA material to enzymes that make specific cuts in the DNA strands that result in "characteristic" fragments or pieces in the DNA (in regions with high inter-individual variability).  So when these fragments are identified, it is matched against others who may or may not have the same fragment patterns (i.e. 1 out of 20,000 people will have an identical pattern).
152161
There are certain identifiable characteristics that can be found in some blood samples. The most prominent example is Sickle Cell anemia.  \nThat's just from blood. However, from DNA markers, it is possible to identify certain genomes that would give you a pre-disposition to certain races.  It may not be a definative race, but it could narrow down possibilities until you can come up with a high probability.
173739
I'm pretty sure under the SA law, as well as any federal laws, a person does not have to disclose any confidential evidence without charge to authority, or other lawful reason. So unless your friend can get a warrant, I'm afraid both men's DNA cannot be tested without approval. \n\nFrom your question, your friend should have contact with the other. Perhaps she can convince that person to do the DNA test. Otherwise, she can resort to hiring private detectives and see what they can do.
354479
i think that anytime you do anything you should have both your fingerprint and DNA recorded, the bigger the database the larger chance of criminals being caught. even for little things like traffic tickets - at least that way there is a real database. The only people who can be caught are those whose DNA is already on record; or the police have to go and get the DNA. That would bring in the whole: Do they really need to take my DNA for a parking ticket but  the general populace should have nothing to fear - unless they are planning to do something wrong. It would just make us safer and better able to put the right people behind bars.
235929
Simply:\nTake sample cells from your body where a mutation is expected, and from a normal site.\n\nUse an enzyme to dissolve the cell's membrane\n\nUse alcohols to separate the DNA from the solution.\n\nTake the solution and use PCR (Polymerase Chain Reaction) to technically clone the DNA (make copies of it), but add in both normal and abnormal nucleotides (For both the mutated and non-mutated)\n\nPut it in a gel electrophoresis chamber and run electricity through the solution.\n\nYou can actually separate the abnormal nucleotides into specific chambers (A C G T )\n\nThe DNA fragments will separate throughout the gel and will create a pattern which shows the order of the nucleotides so you can find the specific code for the DNA.\n\nCompare the suspected mutated one to the normal cell.\n\n(It's pretty complex but that's the simple version)
447693
You would end up with the already existing DNA being split in some way. This means that neither of the two daughter cells would have all of the genetic material they need.
358628
There are four basic patterns used to classify fingerprints -the arch, the loop and the whorl, and the composite (which is a combination of the arch, loop and whorl). If you think of a military map or a bushwalker's map, an "arch" is a gentle rise, a "loop" is a ridge, while a "whorl" is a solitary hill or peak.\nTo match one fingerprint to another fingerprint, the fingerprint officer has to find a certain number of recognisable features that are the same in each fingerprint - these are called similarities. In most countries, there have to be more than eight such similarities between the fingerprints, before they can be counted as admissible evidence.\n\nIdentical twins happen when a single fertilized egg splits into two embryos. Each of the embryos has identical DNA, so surely the new-born babies should greet the world with identical fingerprints?\nFingerprints are laid down between the 13th and the 19th week of growth in the womb. There are at least two factors that can give different fingerprints.\n\nFirst, the DNA doesn't make a perfect copy of itself every time it divides - it picks up mutations. To get from one single cell to the 10-100 trillion cells of a grown adult human, the DNA has to divide many many times. This gives ample opportunity for many mutations to accumulate.\nSecond, the mathematicians tell us that if the foetus had flattened finger pads, the baby is more likely to have the simpler arch pattern, or the slightly more complicated loop pattern. But on the other hand, if the foetus had swollen finger pads, baby is more likely to have the more complex whorl pattern of ridges. The two identical twins might grow in the same uterus, but they have different lengths and diameters of umbilical cord, so they will each get a different blood flow. The twin with the lesser blood flow will cut down the blood flow to the lower body, to preserve it for the brain. By an accident of anatomy, this gives more blood flowing into the arms. The baby ends up with proportionately bigger fingers, and more whorls in their fingerprints.\n\nIn 2003, a paper called On the similarity of identical twin fingerprints was published in The Journal of the Pattern Recognition Society. They found that the fingerprints of 94 "identical" twins were not identical - although they were more similar than non-related people. \nVarious organisations collect fingerprints, but the FBI probably has the biggest collection. They have over 200 million sets of fingerprints - but then, so does every house with small children!
54744
your good luck or perhaps doule check your Dna
39503
Okay i never heard of the law of DNA but to answer the question.  If the condition of hair, straght or curly, is defined by a single gene, than there are two types.  The is a straight gene and a curly gene.  So everyone has two copies of the gene.  One from mom and one from dad.  So if mom gives a curly gene, and dad gives straight, which one will it be?  Well that is described by the law of domninance.  One gene will be stronger than the other.  One allele will out shine the other.  So you need to find out, which gene is dominant and which is recessive.  thats your answer
302527
Histology is about tissues, I think. Why don't you do a shared DNA percentage study. For instance, our percent shared DNA is exrtremely high with great apes ,of course. So, how would it match other mammals? Or, maybe even non-mammals like fish or something. If you don't like that idea, you could always test for pollutants and toxins in the tissues of various animals.
319636
the DNA that you have will do you no good and will not be able to be used in court . the police did not collect it and unless the guy has aids or HIV the spit is useless as evidence . the proper way to store DNA is in a glass or plastic tube . the only time DNA is used is in murder ,rape and other capital offenses\nand this is not a chat room you will be reported for abuse if you reply to every answer
33575
It depends.\n\nIf there is any tissue or marrow left you could do a crude DNA analysis and look for X and Y chromosomes.\n\nIf you had some history you could do a bone size/mass analysis. We know that males and females have different growth curves and rates. Looking at the size of the bones, you could determine a number of factors if you started with at lest one bookmark point like date of birth.\n\nIf you look at a cross section of the bone, depending on preservation, there are celluar differences that will help determine this, as well as racial background.\n\nOne nice thing about fiction, is that you can take liberties. Look at the TV Show CSI. Its a hit. But do you really think it is all done that way? DNA analysis takes days not minutes. Most times, the CSi techs are specialized and do only one aspect, like fingerprint analysis, they do not disassemble cars, run simulaions and do fingerprint analysis. So the point is that iwth a good story, the little details are overlooked and forgiven. You could very easily fugde the science and few would notice and of those that did, if the story was decent few would care. Another example, Jurassic Park. It was based on science in concept. Cloning is possible. Amber contains insects with blood from the time of dinosaura. Why not combine the two and clone T-Rex. Sounds good, but it does not mention all the details that make this impossible. But it was a great story, so the reader just doen't even think about it.\nGood luck with your novel.
503638
DNA fingerprinting is commonly used to probe our heredity. Since people inherit the arrangement of their base pairs from their parents, comparing the banding patterns of a child and the alleged parent generates a probability of relatedness; if the two patterns are similar enough (taking into account that only half the DNA is inherited from each parent), then they are probably family. However, DNA fingerprinting cannot discriminate between identical twins since their banding patterns are the same. In paternity suits involving identical twins - and yes, there have been such cases - if neither brother has an alibi to prove that he could not have impregnated the mother, the courts have been known to force them to split child care costs. Thankfully there are other, less “Jerry Springer-esque”, applications that teach us about our origins. When used alongside more traditional sociological methodologies, DNA fingerprinting can be used to analyse patterns of migration and claims of ethnicity.\n\nDNA Fingerprinting can also tell us about present-day situations. Perhaps best known is the use of DNA fingerprinting in forensic medicine. DNA samples gathered at a crime scene can be compared with the DNA of a suspect to show whether or not he or she was present. Databases of DNA fingerprints are only available from known offenders, so it isn't yet possible to fingerprint the DNA from a crime scene and then pull out names of probable matches from the general public. But, in the future, this may happen if DNA fingerprints replace more traditional and forgeable forms of identification. In a real case, trading standards agents found that 25% of caviar is bulked up with roe from different categories, the high class equivalent of cheating the consumer by not filling the metaphorical pint glass all the way up to the top. DNA fingerprinting confirmed that the ‘suspect’ (inferior) caviar was present at the crime scene.\n\nfor more information please click the link below:\nhttp://www.thenakedscientists.com/html/columnists/dalyacolumn8.htm
554076
They may still exchange some pubic hair and skin cells- and there is plenty of dna in there-d