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Haplogroup J is a human mitochondrial DNA (mtDNA) haplogroup. The clade derives from the haplogroup JT , which also gave rise to haplogroup T . Within the field of medical genetics , certain polymorphisms specific to haplogroup J have been associated with Leber's hereditary optic neuropathy .
Haplogroup J-M267, also commonly known as Haplogroup J1, is a subclade (branch) of Y-DNA haplogroup J-P209 (commonly known as haplogroup J) along with its sibling clade haplogroup J-M172 (commonly known as haplogroup J2). (All these haplogroups have had other historical names listed below. [Phylogenetics 1] [Phylogenetics 2])
Contemporary human mtDNA haplogroup distribution, based on analysis of 2,054 individuals from 26 populations. [1] (a) Pie charts on the map. (b) Counts of haplogroups in table format. For populations details, see 1000 Genomes Project#Human genome samples.
Y-DNA haplogroups map of the world. Each haplogroup originates from, and remains part of, a preceding single haplogroup (or paragroup). As such, any related group of haplogroups may be precisely modelled as a nested hierarchy, in which each set (haplogroup) is also a subset of a single broader set (as opposed, that is, to biparental models ...
Haplogroup J-M304, also known as J, [Phylogenetics 1] is a human Y-chromosome DNA haplogroup.It is believed to have evolved in Western Asia. [2] The clade spread from there during the Neolithic, primarily into North Africa, the Horn of Africa, the Socotra Archipelago, the Caucasus, Europe, Anatolia, Central Asia, South Asia, and Southeast Asia.
[12] [84] This suggests that 95% of Indigenous American mtDNA is descended from a minimal genetic founding female population, comprising sub-haplogroups A2, B2, C1b, C1c, C1d, and D1. [85] The remaining 5% is composed of the X2a, D2a, C4c, and D4h3a sub-haplogroups. [84] [85] X is one of the five mtDNA haplogroups found in Indigenous Americans.
(Data from studies conducted before 2004 may be inaccurate or a broad estimate, due to obsolete haplogroup naming systems – e.g. the former Haplogroup 2 included members of the relatively unrelated haplogroups known later as Haplogroup G and macrohaplogroup IJ [which comprises haplogroups I and J].)
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