How does a paternity test work?

Jun 6, 2017 | | Say something

How does a paternity test work? ; Paternity test


Paternity testing has gained enormous popularity to provide accurate results in determining paternity. paternity test is considered by far, one of the most reliable methods to confirm the biological father of a child. The process is simple and surprisingly fast that reconciles the most perplexing notions that arise in your mind time and again. In addition, these tests are also recognized as the main evidence for custody cases in court.

an individual’s DNA has not changed in the non-reproductive cell. Sexual reproduction brings together random DNA from the mother and father for the formation of a unique combination of genetic material into a cell fresh. This implies that the genetic material of blood is obtained from both parents. This genetic material is known as the nuclear genome of a person, only to be found inside the nucleus.

About DNA profiles

In contrast DNA sequence of an individual to the sequence of another individual can test whether one comes from the other. Moreover, this process involves testing for a literal copy of the genome of an individual to another. A positive result means one of two people to be the father of the second person.

addition to the existing nuclear DNA in the nucleus, the cells also have mitochondria containing genetic material known as mitochondrial DNA. As a matter of fact, mitochondrial DNA is received from the mother alone, without stirring.

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is, however, easier to establish paternity if the procedure involves comparing the mitochondrial genome rather than comparing the nuclear genomes. By contrast, comparison of mitochondrial genomes can provide results only if there is a connection through a common descent coming from maternal side through only a common ancestor. (Read: Coming through IVF – a child with three parents )

Although paternity tests a child male Y chromosome compared to be directly passed to the son of his father.

How does a paternity test work work?

paternity test compares a child’s DNA to a prospective father in 20 different ways. These aspects are known as “points” in medical language.

  • These points have been equipped with different names called microsatellites. These microsatellites are short tandem repeats (STR), simple sequence repeats (SSR) or variable number tandem repeats (VNTR).
  • Put simply, these microsatellites are the points in the DNA where the repetition of a specific type of DNA occurs. For example, some people may have 8 copies of ATGC at a specific point, while others may have 10 or 12 or whatever. This means that achieve D3S1358, 17/18 involves 17 repetitions on a chromosome and 18 on the other in D3S1358 microsatellite.
  • The two resulting numbers are obtained from the fact that there are two copies of chromosomes X and Y – chromosomes. Our body gets one chromosome from each pair, one from the mother and one from the father.
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accuracy paternity testing

is used for the determination of paternal biological matrix, is similar to any other test test, ie in proximity, but not 100% accurate. In contrast, the great results they provided indisputable proof in the court of law. results of paternity tests are interpreted in two ways, viz. inclusion and exclusion.

Types of paternity testing

  • Test Exclusion

The exclusion of evidence is considered to it is 100% reliable as the child’s DNA compared with DNA from the father. Half of the DNA chromosomes come from the father a child. Therefore, the test excludes a parent without finding pairs of chromosomes with the child.

  • Inclusion Test

On the other hand, the inclusion test is very different. The results of this type of test provides the probability of a parent DNA to match child biologically DNA. The results are usually performed as a percentage, with 99 percent and considered the best of all.

  • Points Loci
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points that match the DNA are referred to as loci points in medical terms. The results of paternity tests are generally determined with the help of count loci extracted from the donor. The test result obtained by a count of 16 loci is believed to provide the best results. Furthermore, some of paternity tests, carried out with 13 loci count, provide less accurate results in contrast to what can be obtained with the count of 16 loci.

The samples for paternity testing

Taking a sample is very simple. All you have to do is take a mouth swab from the mouth. The swab will be closed, will be marked and sent to the laboratory for analysis. Once you assigned DNA sample, compared with the DNA of the other participants for the paternity test.

While the DNA of the mother is generally not required for the paternity test, it is best to send along as it helps speed up the process.


Mutations in Y-STR loci: Implications for paternity test and forensic analysis

Kayser M, Sajantila A.

Forensic Sci Int 2001 May 15..; 118 (2-3):. 116-21

PMID: 11311822

This article was originally published on thehealthsite, Read the original article here


Posted in: DNA Testing, Parenting, pregnancy

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