Dna Analysis For Twins
Whether or not twins are identical or fraternal makes a huge difference when it comes to twins and DNA testing. Identical twins make DNA testing much easier as far as testing multiples go because they have the same DNA make-up. Fraternal twins are a bit more complicated because in rare cases fraternal twins can have different fathers. It is estimated that 1 in 12 set of fraternal twins are known as bipaternal, or do not share the same father.
When you do a DNA test on identical twins you still should test them together. First, the twins should each give a sample and those samples should be compared to confirm that they are in fact identical. Then, the father’s DNA sample should be compared to the twins’ genetic profile. In matters of law courts require the father’s DNA is compared to both children regardless of the fact that their DNA is identical.
When it comes to fraternal twins there are certain steps that need to be followed to perform DNA testing properly. Naturally, you would start DNA testing by taking a sample from each of the twins, the mother, and the potential father. This will determine if he is the father of both twins, one twin, or neither twin.
If during phase one of DNA testing fraternal twins the potential father is deemed the father of both twins you need not go any further. However, that may not be the case for everyone. Naturally, the results could prove he is not the father of either twin, but they could also prove that he is the father of one twin and not the other. In either case you would move on to the next test subject to determine parentage of one of both of the twins.
Fortunately, in most situations a repeat sample is not necessary for the children or mothers involved in repeated DNA testing. This remains true regardless of how many potential fathers you have tested. As long as proper protocol is followed during collection the original sample can be used repeatedly.