DNA Marker Index information for Chromosome: Y Marker: M340Names and Aliases for this DNA Marker: M340, rs369807771, rs796891850.Chromosome Position in hg38 Human Genome assembly1: 19716813.Chromosome Position in hg19 assembly2: 21878699 .Ancestral marker allele value: G.Derived, alternative, or mutated marker allele value: C.