can a dna test be wrong?

Question

if there are 7 exclusions in a dna test that means there are 9 inclusions. Would that explain similarities between people? What is the margin of difference before declaring an exclusion?

Answer 1

Yes, it is possible for a DNA test to be wrong when either the mother of her child(or both, but that is extremely rare) is a chimera. Chimerism occurs when two or more embryos fuse together in the womb. Scientist are not sure why, but these embryos form the different parts of the baby's body, resulting in different parts of the body having different DNA. Therefore, a woman's blood DNA can be different from the DNA in her thyroid, reproductive organs, etc. When DNA tests are performed later, the DNA may not match because of the child's DNA would match that of their mother's reproductive organs, and the DNA tested may be taken from the blood or a cheek swab. The only way to diagnose chimerism is for a DNA test to come up wrong, those results to be appealed, and the different organs of the body to be retested several times. Chimerism is extremely rare, and that one of the few instances when DNA tests can be wrong between people who are known to be related.

Answer 2

DNA can be wrong, but if the test is done correctly, the chances of an error are astronomically small. The similarities cannot be explained on the 9 inclusions alone, but that is at least a stepping stone. As for the margin of difference, I don't know. You might try consulting a biology teacher on that one.

Answer 3

There most certainly are mistakes. There are also people with duplicate DNA. Just because it is statistically unlikely or rare does not mean it is impossible.
Don't you remember the entries on the National Dna Database that were deleted because they were identical? Two people with the same DNA?
As for errors, its statistically unlikely that two tests would be wrong in an identical way so if you're in doubt have another test.

Answer 4

The main issue is the relatedness of the two samples. For instance on a remote island community where the gene pool is very small, a perfect example is pitcairn island, there is a much higher probability of two samples being very similar although of course its still very unlikely.

Another factor is how well the sample is taken, if not done well then accuracy of result is affected due to the difficulty of being able to read individual bands.

Answer 5

there has been a case that the moms dna didnt tournament any of her youthful ones. Its observed as chimerism. like the dna contained in the persons blood became diverse from the dna taken from a swab contained in the mouth. yet back to the concern I accept as true with each and absolutely everyone...the try will teach that between the boys is the daddy. no longer both.

Answer 6

yes it is true.sometimes a mother embreos combine together.such as two twins combining.and making one baby than twins.if this happens twin A and twin B bloods combine .if the blood doesnt combine,such as A A,the blood would be A B. it really sucks when your taking dna for your child because the blood they take sometimes doesn't match your.but its really your blood.they just took the blood cells of your twin without the doc knowing it. also sometimes your blood cell can be in other organs such as the liver, heart etc.... its realyyyyyyyyyyyyyy complicated.

Answer 7

dna test can be wrong if one of the persond has undegone a mutation in the sequence which is to be tested for similarity,most common mutations observed in human genome are the single nuclertide polymorphisms which involve single base changes,and their no. is around 2.4 million.

Answer 8

Q #1:yes Q#2: yes Q#3:1oo%

Answer 9

Yes, there are such people who have 2 sets of DNA. They are called Chimeras.

Answer 10

It can be if someone else took the test for the person you wanted to have tested