> Multiple studies indicate that the presence of the two phenotypes "lactase persistent" and "lactase non-persistent (hypolactasia)" is genetically programmed,

> Multiple studies indicate that the presence of the two phenotypes "lactase persistent" and "lactase non-persistent (hypolactasia)" is genetically programmed, and that lactase persistence is not necessarily conditioned by the consumption of dairy products after the suckling period. https://en.wikipedia.org/wiki/Lactase_persistence https://en.wikipedia.org/wiki/Lactase_persistence