How DNA was found in the first place. ?
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Watson and Crick discovered it while researching "genetic material." For further information, check this site.
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According to the watson and crick model the DNA\nStucture is built like a spiral staircase .\nFr the rest of it try th link below.
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You've probably heard the fact that our DNA is 98% the same as that of a monkey, what many people don't know is that our DNA is also about 80% the same as that of a fruit fly. Dog DNA probably comes in somewhere in between. I don't think anyone has ever done a study on that though.
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Before DNA pieces were put into gel and a picture was taken with no mathematical measurements. Now, using southern blotting we attribute mathematical relationships between pieces of DNA>
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I can't recall the exact year, but it was about 15 years ago in England.  A young girl was raped and murdered in a small village.  DNA testing was in the infant stages.  Every male in the village was required to take a blood test for DNA analysis.  One man had a friend go in his stead on the guise that he was deathly afraid of needles - and that guy turned out to be the perpetrator.
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These types of DNA are used to create a much more accurate diagnosis of DNA samples lef tfrom teh crime\n\nemail me a kkstrong0@yahoo.com if you have further questions and ill try to tell you what i know
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No possible way of knowing that since nobody (I am quite sure) has gone back and tried to determine whether the particular DNA evidence used in all those cases was "accurate" or "inaccurate."  In general, however, it is my belief that when performed properly and correctly used, DNA evidence is virtually infallible.
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DNA can trace a long ways back. There are "markers" that persons of the same relation will carrying. one set of markers is for your mothers side and another from your fathers side. if i rememeber right the mothers side is a little eaiser to trace back. :)
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Bones contain cells, osteoclasts and osteoplasts.  I remember a colleague doing studies on ancient camel bones to look for genetic variation.  So, yes, DNA can be extracted.  Usually it's so fragmented though.  Maybe DNA can be obtained, maybe not.  This level of technology may be beyond us yet still.  We are talking of something that is hundreds of millions years old, not just a few thousand.
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Avery and his coworkers extracted a substance from a bacterium with a smooth surface and introduced it into a rough-surfaced bacterium. When the rough-surfaced bacteria transformed into the smooth-surfaced type, he knew the substance he had extracted contained the gene that coded for the smooth surface. Avery's team purified this substance and found it was pure DNA.
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In criminal cases, this generally involves obtaining samples from crime-scene evidence and a suspect, extracting the DNA, and analyzing it for the presence of a set of specific DNA regions (markers).\n\nScientists find the markers in a DNA sample by designing small pieces of DNA (probes) that will each seek out and bind to a complementary DNA sequence in the sample. A series of probes bound to a DNA sample creates a distinctive pattern for an individual. Forensic scientists compare these DNA profiles to determine whether the suspect's sample matches the evidence sample. A marker by itself usually is not unique to an individual; if, however, two DNA samples are alike at four or five regions, odds are great that the samples are from the same person.\n\nIf the sample profiles don't match, the person did not contribute the DNA at the crime scene.
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Origin of the first life.
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Discovery of the structure of DNA\nIn the 1950s, three groups made it their goal to determine the structure of DNA. The first group to start was at King's College London and was led by Maurice Wilkins and was later joined by Rosalind Franklin. Another group consisting of Francis Crick and James D. Watson was at Cambridge. A third group was at Caltech and was led by Linus Pauling. Crick and Watson built physical models using metal rods and balls, in which they incorporated the known chemical structures of the nucleotides, as well as the known position of the linkages joining one nucleotide to the next along the polymer. At King's College Maurice Wilkins and Rosalind Franklin examined X-ray diffraction patterns of DNA fibers. Of the three groups, only the London group was able to produce good quality diffraction patterns and thus produce sufficient quantitative data about the structure.\n\n\nhttp://en.wikipedia.org/wiki/DNA#Discovery_of_the_structure_of_DNA
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While the period from the early 1900s to World War II has been considered the "golden age" of genetics, scientists still had not determined that DNA, and not protein, was the hereditary material. However, during this time a great many genetic discoveries were made and the link between genetics and evolution was made.\n\nFriedrich Meischer in 1869 isolated DNA from fish sperm and the pus of open wounds. Since it came from nuclei, Meischer named this new chemical, nuclein. Subsequently the name was changed to nucleic acid and lastly to deoxyribonucleic acid (DNA). Robert Feulgen, in 1914, discovered that fuchsin dye stained DNA. DNA was then found in the nucleus of all eukaryotic cells.\n\nDuring the 1920s, biochemist P.A. Levene analyzed the components of the DNA molecule. He found it contained four nitrogenous bases: cytosine, thymine, adenine, and guanine; deoxyribose sugar; and a phosphate group. He concluded that the basic unit (nucleotide) was composed of a base attached to a sugar and that the phosphate also attached to the sugar. He (unfortunately) also erroneously concluded that the proportions of bases were equal and that there was a tetranucleotide that was the repeating structure of the molecule. The nucleotide, however, remains as the fundemantal unit (monomer) of the nucleic acid polymer. There are four nucleotides: those with cytosine (C), those with guanine (G), those with adenine (A), and those with thymine (T).
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http://www.law-forensic.com/post_con_dna_1.htm
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Try this\nhttp://www.globalonlinesvcs.com/DNA_Testing.html
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NO. DNA can only be used to identify a person or being, or link to two persons/beings together. It can not PROVE a crime was committed.