Chromosome Pile-Ups in Genetic Genealogy: Examples from 23andMe and FTDNA

    What we aim to accomplish: Dissuade people from chasing after small autosomal DNA segments by demonstrating too-common matching in particular regions of chromosomes; emphasizing the pitfalls of half-identical matching; briefly reviewing linkage measurements, emphasizing chromosome region lengths (in centiMorgans) as approximations. Illustrate the need that AncestryDNA had for redesigning their matching system to account…

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