| Sibling DNA testing is designed to
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| | siblings. For instance, a DNA index of
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| determine sibling genetic relationships.
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| | less than 1.00 indicates non-relatedness,
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| Such tests establish the statistical
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| | whereas a DNA index of greater than 1.00
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| probability of whether the siblings share
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| | indicates that the two tested individuals
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| the same two parents. A DNA sibling test
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| | are more likely to be true biological
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| can be performed to analyze the
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| | siblings.
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| relationship of biological siblings by
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| | A half-sibling DNA index can also be
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| collecting samples from both siblings;
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| | obtained to determine whether the
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| however, including one common parent
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| | siblings share only one common parent,
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| increases the accuracy of this type of
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| | versus two common parents. The ratio of
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| analysis, and is highly recommended.
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| | the half DNA index versus the full DNA
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| While conducting sibling DNA testing, the
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| | index establishes whether the two
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| DNA laboratory determines the genetic
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| | individuals share one parent or two
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| profile of the alleged siblings and,
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| | parents. DNA testing can also help
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| based on the type of genetic material
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| | determine if twin siblings are fraternal
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| inherited by each sibling, a DNA index is
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| | or identical. For instance, if the DNA
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| determined. Based on the results of the
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| | profiles of the twins are different then
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| DNA index, the sibling relationship is
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| | the siblings are considered fraternal;
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| established and a higher value DNA index
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| | however, if the profiles are identical
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| indicates a greater likelihood that the
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| | then a probability of being identical
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| two individuals are true biological
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| | twins is calculated.
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