Almost. Lactase persistence is more frequent among people with a cattle history. It's common in certain groups in Africa, notably the Tuareg and Fulani. It must

Almost. Lactase persistence is more frequent among people with a cattle history. It's common in certain groups in Africa, notably the Tuareg and Fulani. It must have developed separately multiple times. https://en.wikipedia.org/wiki/Lactase_persistence#Distribution https://en.wikipedia.org/wiki/Lactase_persistence#Distributi...