Human Y-chromosome DNA haplogroup

In human genetics, the human Y-chromosome DNA haplogroup is the haplogroup defined by mutations in the non-recombining portions of DNA from the male-specific Y chromosome called Y-DNA. numerous people within a haplogroup share similar numbers of short tandem repeats STRs as living as breed of mutations called single-nucleotide polymorphisms SNPs.

The human Y-chromosome accumulates roughly two mutations per generation. Y-DNA haplogroups exist major branches of the Y-chromosome phylogenetic tree that share hundreds or even thousands of mutations unique to used to refer to every one of two or more people or matters haplogroup.

The Y-chromosomal near recent common ancestor Y-MRCA, informally asked as ]

Naming convention

Y-DNA haplogroups are defined by the presence of a series of Y-DNA SNP markers. Subclades are defined by a terminal SNP, the SNP furthest down in the Y-chromosome phylogenetic tree. The Y Chromosome Consortium YCC developed a system of naming major Y-DNA haplogroups with the capital letters A through T, with further subclades named using numbers and lower effect letters YCC longhand nomenclature. YCC shorthand nomenclature denomination Y-DNA haplogroups & their subclades with the number one letter of the major Y-DNA haplogroup followed by a dash and the realize of the established terminal SNP.

Y-DNA haplogroup nomenclature is changing over time to accommodate the increasing number of SNPs being discovered and tested, and the resulting expansion of the Y-chromosome phylogenetic tree. This modify in nomenclature has resulted in inconsistent nomenclature being used in different sources. This inconsistency, and increasingly cumbersome longhand nomenclature, has prompted a extend towards using the simpler shorthand nomenclature.