Calculate Combined Paternity Index (CPI) for DNA Testing

Consider the table below where a child and a possible father (PF) share the listed paternity indices for each locus listed (LOC-A1, LOC-B2, LOC-C3, LOC-D4).Locus Tested PF Child Paternity IndexLOC-A1 3 2/3 2.18LOC-B2 7/5 5 0.798LOC-C3 15/17 9/17 5.21LOC-D4 12 12 1.37Based on the data presented in the table, what is the combined paternity index, CPI, from the loci tested: LOC-A1, LOC-B2, LOC-C3 and LOC-D4?12.429.55815.562.38

12.42 ( CPI is calculated by multiplying all Paternity index tgt)

To calculate the combined paternity index (CPI), we need to multiply the paternity indices of each locus tested.

CPI = Paternity Index LOC-A1 x Paternity Index LOC-B2 x Paternity Index LOC-C3 x Paternity Index LOC-D4

CPI = 2.18 x 0.798 x 5.21 x 1.37

CPI = 15.56

Therefore, the combined paternity index (CPI) from the loci tested: LOC-A1, LOC-B2, LOC-C3 and LOC-D4 is 15.56.

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