We men inherit the Y chromosome from our fathers who got it from their fathers. So the Y chromosome can be used to trace your paternal lineage. Different sequences of alleles and mutations can be assigned to haplogroups where a haplogroup signifies common descent on the uniparental line.
Similarly, we all inherit mitochondrial DNA from our mothers. The sequence of alleles and mutations on the mitochondrial DNA (mtDNA) is also organized into phylogenetic tree.
I can trace my maternal line to Egypt (my great-grandmother) and thus I expected a maternal haplogroup common in the eastern Mediterranean. It turns out I belong to haplogroup H, which everyone and their mother belong to in Europe as can be seen in this map.
According to Wikipedia,
Haplogroup H is the most common mtDNA haplogroup in Europe. About one half of Europeans are of mtDNA haplogroup H. The haplogroup is also common in North Africa and the Middle East. The majority of the European populations have an overall haplogroup H frequency of 40%–50%. Frequencies decrease in the southeast of the continent, reaching 20% in the Near East and Caucasus, 17% in Iran, and <10% in the Persian Gulf, Northern India and Central Asia.
Since 23andme didn’t tell me which subgroup of H I belonged to, I used mthap by James Lick:
Your rCRS differences found:
CR: 750G 1438G 4769G 15326G
Best mtDNA Haplogroup Matches:
Amber’s maternal haplogroup is M4a, which is mainly found in South Asia.