Abstract

In this paper we introduce a new likelihood ratio method for evaluating mixed Y-STR profiles that is based on the premise that, given a haplotype has been seen in the person of interest, the most likely source of a second haplotype, matching at all or most loci, is in an individual with a recent common ancestor. We have called the new method the "Haplotype centred" (HC) method for likelihood ratio derivation. For single source, unambiguous haplotypes the HC method performs identically with the Kappa method proposed by Brenner.

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