What makes Lactase Persistence so interesting to me is that it's a dietary genetic mutation that has occurred in homo sapiens that has created a clear delineation within the world population. Sometime between 4500 and 4000 BCE, a group or groups of people adapted to their diet of milk, even after weaning off of mother’s milk. This adaptation allowed their bodies to process lactose long into adulthood. If you can drink milk without difficulty, it's reasonably safe to assume you can trace your ancestry to Western Eurasia and/or parts of the Mediterranean. If you can't drink milk as an adult, some of your ancestors come from elsewhere in the world.
03.04 04.04 05.04 07.04 08.04 10.04 11.04 01.05 02.05 03.05 04.05 07.05 08.05 11.05 12.05 01.06 02.06 05.06