In human genetics, Haplogroup Z is a human mitochondrial DNA (mtDNA) haplogroup.
Haplogroup Z is believed to have arisen in Central Asia, and is a descendant of haplogroup M.
Its greatest variety is found in Korea, northern China, and Central Asia. However, its greatest frequency appears in Russia and among the Saami people of northern Scandinavia.
Spread of haplogroup Z. Image source