Tese results indicate that Tommy
and Mark’s DNA match among all 20 markers. Te complete test results show the correlation between Tommy and Mark, and we can draw a conclusion that Mark is indeed Tommy’s biological father. Scientifically, each marker is assigned with
a Paternity Index (PI), which is a statistical measure of how powerfully a match a particular marker indicates paternity. Te PI of each marker is multiplied with each other to generate the Combined Paternity Index (CPI), which indicates the overall probability of an individual being the biological father of the tested child relative to any random man from the entire population of the same race. Te CPI is then converted into a Probability of Paternity, showing the degree of relatedness between the alleged father and child. In this example the probability of paternity is 99.99 percent and the strength of the test, or CPI, is 272,371 to 1. In the above example, the probability of
paternity is satisfactory but the CPI is on the low side. Te CPI can be strengthened significantly by testing the mother. Remember, we receive alleles from both
26 datia focus
our mother and our father. If we can first determine which alleles were inherited from the mother, then, statistically, we would only need to solve for the father. Table 2 shows the results of another paternity test where the mother was added to testing. Te probability of paternity improved to 99.9999 percent but the CPI is strengthen significantly—to over 4 trillion to 1. Now that we have a basic understanding
of paternity testing, how can we help baby Charlote prove to the SSA that the man who died in the car crash was in fact her biological father? Looking for linear relational testing
opportunities would be a great option; however, Charlote’s paternal grandparents were also deceased and cremated, and therefore unavailable for testing. We also explored avuncular DNA testing, but there were no aunts or uncles available to test. I was beginning to see why Charlote’s mother seemed so distressed. Running out of direct line descendants, I asked Charlote’s mother if her deceased husband was previously married, and if they had children who would be willing to test. Her answer was yes to a previous marriage; yes, that marriage
summer 2017
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