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Sibling DNA Testing

Sibling DNA testing is designed totrue biological siblings. For instance,
determine sibling genetic relationships.a DNA index of less than 1.00 indicates
Such tests establish the statisticalnon-relatedness, whereas a DNA index of
probability of whether the siblingsgreater than 1.00 indicates that the two
share the same two parents. A DNAtested individuals are more likely to be
sibling test can be performed to analyzetrue biological siblings.
the relationship of biological siblingsA half-sibling DNA index can also be
by collecting samples from bothobtained to determine whether the
siblings; however, including one commonsiblings share only one common parent,
parent increases the accuracy of thisversus two common parents. The ratio of
type of analysis, and is highlythe half DNA index versus the full DNA
recommended.index establishes whether the two
While conducting sibling DNA testing,individuals share one parent or two
the DNA laboratory determines theparents. DNA testing can also help
genetic profile of the alleged siblingsdetermine if twin siblings are fraternal
and, based on the type of geneticor identical. For instance, if the DNA
material inherited by each sibling, aprofiles of the twins are different then
DNA index is determined. Based on thethe siblings are considered fraternal;
results of the DNA index, the siblinghowever, if the profiles are identical
relationship is established and a higherthen a probability of being identical
value DNA index indicates a greatertwins is calculated.
likelihood that the two individuals are



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