DNA Marker Index information for Chromosome: Y Marker: M634Names and Aliases for this DNA Marker: M634, Y27, V1981, rs575994847.Chromosome Position in hg38 Human Genome assembly1: 8571844.Chromosome Position in hg19 assembly2: 8439885 .Ancestral marker allele value: T.Derived, alternative, or mutated marker allele value: A.