How many different way are there to check DNA?
If you're wondering how to get a DNA test, you can find quite a few DNA labs online. There are certainly walk-in DNA labs scattered around the country, but using an online DNA testing provider is one of the most convenient ways to get a DNA test. For DNA paternity testing, online labs will normally send you a free DNA sample collection kit. Once you've collected your DNA samples, you return them along with payment to the DNA lab.
Most testing for relationships, like paternity, maternity and siblingship, is also divided into DNA testing for peace of mind and DNA testing for legal proceedings. You can get a DNA test for peace of mind quite easily. The cost is usually lower and you can collect your own DNA samples yourself at home. But if the DNA test results are to be used in legal situations, then it's important to purchase legally admissible DNA testing from the lab. For DNA test results to be accepted by a court, DNA samples must be collected by a neutral third party. The third party is there to confirm the identity of the DNA donors and to ensure that chain of custody rules are observed.
Once the DNA samples are collected, they are returned to the lab for analysis. DNA test results can normally be received in as few as five working days. For an extra fee, some DNA labs offer a three day turnaround of test results. Test results are usually mailed to the recipient. Some online DNA labs offer online results.
Prenatal DNA testing is a type of testing performed to ascertain paternal biological relationships. The only difference between a normal paternity test and a prenatal paternity test is the type of sample obtained. Paternal DNA testing is performed during pregnancy and there are two different ways for the sample to be obtained.
DNA can be checked by different methods, some of them are given below:
1. DNA can be reacted with diphenyl amine after dehydration of its sugar deoxyribose. The reaction givees blue color that can be quantified with colorimeter.
2. DNA can be seperated by agarose gel elecrophoresis. The DNA fragments seperated ongel after applying elecricity can be visualised with ethidium bromide. The DNA-ethidium bromide complex absorbs UV light and therefore floreceses with bright pink color.
3. DNA from solutions is determined directly by passing UV light. The DNA bases absorb UV light of 260 wavelength. The absorption of UV radiation is quantitative.