The World Map of Y-DNA Haplogroups.
Heritage has, for most cultures throughout history, been determined through patrilineal descent. Y-DNA is a representation of the migration route of male DNA.
For anyone curious, my Y-DNA is L-M357 from the Harappan or Indus Valley Civilization. Many of my Afghan countrymen with the lighter whiter less oppressed skin of privilege would be an Aryan R1a derivative; no doubt migrating to invade and oppress my people.