DNA Marker Index information for Chromosome: Y Marker: MF646957Names and Aliases for this DNA Marker: MF646957, Y257650, rs768491409.Chromosome Position in hg38 Human Genome assembly1: 20379269.Chromosome Position in hg19 assembly2: 22541155 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: T.