Paternity civil case and calculation - Essay Example

These include the U.S. Federal Bureau of Investigations (FBI) Combined DNA Index System (CODIS) markers used in DNA evidence. Butler (2006) indicates that markers were first described as an effective tool to ascertain human identity in the early 1990’s. Since then they have become important tools which have been employed in order to resolve numerous paternity testing cases. Identigene (n.d.) indicates that genetists developed this set of markers to ensure a level of consistency in identifying individuals and named them according to their chromosomal location.

Each of the marker location shows two alleles (variation values) represented by the numbers in the table below. In this case Identigene (n.d.) indicates that the alleles are measures of short tandem reports (STR). One of the STR alleles is from the mother and one from the father. If at least one of the markers for each STR locus matches then there is assumed to be a high probability of a paternity relationship. On the other hand if at least one of the markers for each STR locus does not agree with the alleged father’s then this is an indication that there is no paternity relationship.

A paternity index that is greater than 100 yields a CPI of 99.0000%; one that equates to 200, yields a CPI of 99.5%; and one that equates to 1000 yields a CPI of 99.9900%. Identigene (n.d.) indicates that immigration cases require a CPI value of 200 or better. The International Society of Forensic Genetics (ISFG) has a number of recommendations on biostatistics in paternity testing. These include: the importance of a statement of a hypothesis; information on how the calculations are done, considerations for the possibility of mutations whenever a genetic inconsistency is observed; guidance relating to the possibility of a single allele in a tested subject; as well as the details that should be presented in test reports.

According to Gjertson et al (2007) the International