DNA Marker Index information for Chromosome: Y Marker: M12135Names and Aliases for this DNA Marker: M12135, B2, rs554180975.Chromosome Position in hg38 Human Genome assembly1: 7816371.Chromosome Position in hg19 assembly2: 7684412 .Ancestral marker allele value: C.Derived, alternative, or mutated marker allele value: G.