Haplogroup

In molecular evolution, a haplogroup (from the ἁπλούς, haploûs, `onefold, single, simple`) is a group of similar haplotypes that share a common ancestor having the same single nucleotide polymorphism (SNP) mutation in all haplotypes. Because a haplogroup consists of similar haplotypes, it is possible to predict a haplogroup from haplotyp.....
Found on http://en.wikipedia.org/wiki/Haplogroup

Haplogroup

A group of similar haplotypes that share a common ancestor with a SNP mutation. Because a haplogroup consists of similar haplotypes, it is possible to predict a haplogroup. A SNP test confirms a haplogroup. Haplogroups are assigned letters of the alphabet, and refinements consist of additional number and letter combinations. Example
Found on https://isogg.org/wiki/Genetics_Glossary
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