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Principles of Forensic DNA for Officers of the Court

Y-STR Statistical Analysis

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illustration of some equations
National Institute of Justice (NIJ) (see reuse policy).

As a result of these factors, the degree of inter-individual Y-chromosome variation is substantially reduced compared to the autosomes.

  • A typical autosomal STR profile may have an expected frequency of occurrence in 1 in every 100 trillion individuals (10 -14 ), whereas a typical Y- STR profile may occur in 1 in every 1000 individuals (10 -3 ).

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