How I can use the PCR for a series of fragments of DNA for testing?
What are the disadvantages to using this procedure to determine who is the victim
The chain reaction of polymerase allows the amplification of short lengths of DNA left at almost any Instead, while there is an amount that is appropriate for the next stage of DNA fingerprinting. First section is isolated and heated to 95 degrees Celsius. Is denatured strands for the next stage, which will take place by the rupture of hydrogen bonds between bases. Free primers bind to single-stranded DNA (ssDNA) molecules in which you want to start copy. Then cooled to 40 degrees Celsius for primer to stick perfectly to the single-stranded DNA. Then the solution is heated again 70 ° C in a solution of free DNA nucleotides bind to the free ssDNA by the enzyme Taq polymerase (which is more thermally stable than eukaryotic polymerase) using the primers, so double the amount of DNA. These steps are repeated as many times as you like until the desired amount of DNA. To identify a person's DNA Cutting these lines. Using a restriction endonuclease that cut the DNA rather than specific base sequences (called short tandem repeats). The distance between each short tandem repeat is unique to each individual. Now that DNA is cut, you are ready to be separated. It is through the process of gel electrophoresis, which separates sections of DNA size, and works on the principle that the DNA molecule is actually negatively charged, which are made primarily on the basis of a special gel slab into small wells near a negative electrode. Then the opposite end of the slab is a positive electrode. When activated DNA molecules are extracted from wells and the bottom of the slab to the positive electrode. The smaller fragments are drawn as large again. The distance is obviously unique to draw people but the fragments can not be seen yet. Now using gene probes. They are like the normal DNA, but the use of a radioactive isotope phosphorus. First, electrophoresis gel is covered with a nylon membrane to remove the DNA strands, and then heated to ssDNA way again. This is incubated with radioactive probes of the gene, and attributed to the sequences free base. This is placed on unexposed photographic film and exposed to radiation. Where there are probes of the genes, the film remains exposed, leaving reason signature. I do not see how PCR + DNA can be a bad thing! Is really just a process that is very accurate
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