Anonymous
Anonymous asked in Pregnancy & ParentingOther - Pregnancy & Parenting · 9 years ago

Why is it that in a paternity test, the father is only 99.9% the father?

I hope that made sense. I didn't really know how to word that :P

when doctors read back the results of a paternity test and say "there is a 99.998% match in the dna"

why is it not 100%?

8 Answers

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  • 9 years ago
    Best answer

    Wow. SO many wrong answers on here.

    Here is why: When doing a paternity test only very small section of your and the child's DNA is analyzed. Typically somewhere between 8-14 markers, depending on the lab. Because they are not comparing the ENTIRE string of DNA, they cannot say 100%.

    The DNA paternity testing lab compares each loci (or marker) and determines how likely it is that two unrelated people would match with that allele (the number) at that loci (or marker). Those probabilities are added up to give you the probability of paternity.

  • Anonymous
    9 years ago

    Maybe because its accuracy is really not totally sharp as 100%. There's a tendency of having a default through the basis which been used. The numbers section of the report reveals the DNA patterns of the individuals tested. People have two genetic markers or numbers, for each DNA system analyzed. One genetic marker was inherited from the mother, and the other genetic marker was inherited from the father. The order in which the genetic markers appear is insignificant. If the combined paternity index is a non-zero number, there is a match between the alleged father and child. If the combined paternity index is a zero, it is a non-match between the alleged father and child. A zero means that the alleged father is excluded as being the biological father of the child. A non-zero number means that the probability of paternity is over 99%.

  • 9 years ago

    Because there is an automatic error built in, it will never be 100%. Also, keep in mind that the 99.998% can be 100% wrong because the lab tech entered the information under the wrong person or the computer glitched. If you get an answer you weren't expecting, have it rechecked or go through another lab.

  • 9 years ago

    well from what i gather it is because there is a chance that two individuals share the same DNA and thus have the same genetic profile; of course, father would have to be from the same ethnic group. But you and someone else could share the same DNA and thus there is always a chance, statistically, that that other man could be the father of your baby. of course, in reality, this sounds so unlikely, that the mother would have met and slept with the man with your same genetic profile.

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  • 9 years ago

    It goes by DNA, You can never have a 100% match, because your child is not a clone of pone parent, so they cannot say a 100% match. If you did a maternity test (checking to see if mum is mum) you can know 100% you gave birth to that child, but at best you'll get 99.99%.

  • Anonymous
    9 years ago

    It's to do with chance. As in, there is a 99.998% chance that you are the father, ie you almost certainly are the father.

  • Callie
    Lv 4
    9 years ago

    No lab test is going to be 100% that's why. Just like home pregnacy test are always 99.999% accurate.

  • 9 years ago

    Unless you never went out with another guy in like high school or middle school, that's probably what your going to get.

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