What is Haplogroup?
[[File:Molecular lineage.png|thumb|300px|right|{{legend|#959595|Ancestral Haplogroup}} {{legend|#ff7a7a|Haplogroup A (Hg A)}}{{legend|#0085ff|Haplogroup B (Hg B)}} All of these molecules are part of the ancestral haplogroup. <br/>At some time, a mutation occurred in the ancestral molecule, mutation A, which produced a new lineage. This is haplogroup A, defined by mutation A. <br/>Later, a new mutation, mutation B, occurred in a person carrying haplogroup A. Mutation B defined haplogroup B. Haplogroup B is a subgroup of haplogroup A. Both haplogroups A and B are subgroups of the ancestral haplogroup]] A '''haplogroup''' is a group of single [[chromosomes]], or single [[DNA]] strands, which share a [[common ancestor]]. They have the same [[mutation]] in all versions.<ref>The technical way of saying this is: they have the same [[single nucleotide polymorphism]] (SNP) [[mutation]] in all [[haplotype]]s.</ref> Haplogroups show deep ancestral origins dating back thousands of years.<ref>The International Society of Genetic Genealogy see Haplogroup definition in DNA--NEWBIE GLOSSARY [http://www.isogg.org/]</ref> In [[human genetics]], the haplogroups usually studied are [[Y-chromosome]] (Y-DNA) haplogroups and [[mitochondrial DNA]] (mtDNA) haplogroups. Both can be used to define genetic populations. Y-DNA is passed only from father to son, while mtDNA is passed only from mother to children. Neither [[recombination|recombines]], and thus Y-DNA and mtDNA change only by chance mutations with no intermixture between parents' genetic material. == Related pages == *[[J1 (Y-DNA)]] == References == {{reflist}} [[Category:DNA]] [[Category:Chromosomes]]