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.
Haplogroups show deep ancestral origins dating back thousands of years.
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 recombines, and thus Y-DNA and mtDNA change only by chance mutations with no intermixture between parents' genetic material.
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- ↑ The technical way of saying this is: they have the same single nucleotide polymorphism (SNP) mutation in all haplotypes.
- ↑ The International Society of Genetic Genealogy see Haplogroup definition in DNA--NEWBIE GLOSSARY