INTERESTING: Genetic Data Suggests Convergent Evolution for Milk Digestion. “The research team found that the geographic patterns in which a genetic variant for milk digestion were present often correlated with historic human migrations and the spread of domestic cattle, camels, and sheep. ‘Our results are showing different mutations arising in different places that are under selection and rising to high frequencies and then reintroduced by migration to new areas and new populations,’ Tishkoff told Science Daily. She suspects that there are other genetic variants for the digestion of milk that have not yet been discovered, and that commensal bacteria in the gut could also help adult humans digest milk.”