Paternity index (PI) calculated
Assuming the parent provides a child the father's genetic father and the possibility of random genetic father as a man to provide children the ratio is called the father of the possibility of parental rights index (paternity index, PI). Former possibility is assumed to be X; latter possibility is assumed to be Y. On the assumption that the parent case for the 24/25 heterozygous genotype 2, he provided the father the possibility of gene FGA-25 1 / 2, ie X = 1 / 2. Random man father gene FGA-25 provides the opportunity for the gene frequency, that is Y = 0.0958. Therefore, in this case the PI is 0.5/0.0958 = 5.22. Assuming that the parent 2 is indeed the child's father, regardless of how many test points, will not rule out his relationship with the child's birth, in all testing sites, each site can calculate a value of PI, multiple-bit point is equal to the cumulative value of PI PI values ​​of the various sites of the product, provided that you point the detection of genetic linkage between the no. Triad genotype combination can be summarized as three principles: (1) When assuming the parent is homozygous at, X = 1; assumed when the parent is heterozygous, X = 1 / 2, but the heterozygous parent of two gene hypothesis genes are likely to be the father, X = 1. (2) involves only a father gene, Y-value is equal to the frequency of genetic father. (3) If the father involved in two genes, Y is 2 and the father of gene frequencies.

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